As mentioned in another answer one part has two similar versions. Picture 3 shows the older 4081a and not the newer 4081b. This might be important, depending on your application. While both parts look to be very similar they have different properties. Older part has narrow/thin ring, which allows you to attach plates vertically on each side of the ring and ...
Part #47458 - Brick, Modified 1 x 2 x 2/3 No Studs, Wing End.
Part #4081a - Plate, Modified 1 x 1 with Clip Light - (Thin) Ring.
Part #4081b - Plate, Modified 1 x 1 with Clip Light - (Thicc) Ring.
Double nods to Phil B. and Zhaph - Ben Duguid ♦ for offering correct answers, but Mark Thrill has provided further detail that might be a program issue, or he might have just said these words in jest.
"I've been looking for it for hours on LDD..."
We know that certain versions of LDD do exclude pieces. The version of LDD that I'm using does have both ...
There are two variant of that, which look very similar:
Stud.IO lists them as:
Brick, Modified 2 x 4 - 1 x 4 with Recessed Studs and Thick Side Arches
Brick, Modified 2 x 4 - 1 x 4 with Recessed Studs and Thin Side Arches
These can be seen below, thick in red on the left, and thin in blue on the right in the top picture (not a valid colour):
This pieces is indeed hard to find, as it is used in building vehicles but does not have a name that has anything to do with that purpose. It is part number 52038 and is called Brick, Modified 2 x 4 - 1 x 4 with 2 Recessed Studs and Thick Side Arches on Bricklink.
These are quite literally Pebe bricks made indeed in GDR.
They are not too uncommon in east german second hand vintage batches, since they blend in quite well, just found this one last week:
It's Part #41489c01 - Duplo Toolo Sloped Brick.
In comments you wrote:
"I also thought that its #45751c01, but the number on brick is 41489" – k1psead
Good question. This is what LEGO.com says about the molded numbers on individual pieces.
So, LEGO is saying the molded number is this piece's specific Design Number and that we can plug this number in ...
This piece looks to be an older Wrench piece:
Minifigure, Utensil Tool Box Wrench - 6-Rib Handle.
Picture shows the part in, what seems to be, in a shade of brown color. Unfortunately this piece doesn't come from LEGO in similar color.
There's a newer piece, with less ribs:
Minifigure, Utensil Tool Box Wrench - 3-Rib Handle.
This part isn't produced by ...
I just confirmed your own self answer, and yes, you are right this part is indeed
x351 Brick, Modified 2 x 2 Racer Driver No Head
This unique piece appears only in 20 sets. Look HERE to see where yours might come from.
That is actually two parts 30351 Electric, Light & Sound Rocket Engine and 30353 Battery Box Cover. That sound and light brick was made in 1999 and only ever came in two sets.
If you look through the assortment you got you might find the Rocket Engine Nozzle that goes with it.
Image from Brick Instructions.
Even though there's no corresponding LEGO piece, you could get away with this substitution:
Part #89522 - Horn (Unicorn).
This is how it would look with the pieces you have, and color wise the Horn comes in metallic silver too.
That would be part 4289 Boat Mast 2 x 2 x 3 Inclined with Stud on Top and Two Sides
As the name implies, it is typically use for a boat mast on modern boat models.
It only ever came in black in one set, 4669 Turbo-Charged Police Boat.
Can anyone help me with this piece (either how to properly describe it when searching catalogues...)
When searching Bricklink.com the syntax is specific too. It only comes up as:
"2 x 2 plates"
Anything different like typing only the singular word "plate", and you'll get no hits.
That's an old 650 Hinge Coupling Nylon - Two Connected 2 x 2 Plates from the 60s.
It only ever came in 20 sets, but it's typically clear. It's listed as a possible alternate for the following set, but it's possible other sets could have had it as an alternate too.
901-2 2 Large Wheels with Accessories
This is set 8386 Ferrari F1 Racer 1:10.
It's hard to tell from your photo exactly what is missing. Obviously the rear spoiler is missing, but there may be several other smaller elements missing.
Brickset and LEGO.com both have the full instructions, so the best way to determine what is missing is probably to walk through those. Here they are:
This is an official LEGO piece. It is called 57467a Minifigure, Weapon Harpoon, 4 Grooves in Shaft and has been produced for almost 20 years, appearing in 37 sets.
Chrome Silver is the common color, Flat Silver (the one on the left in the picture) is the rarer color, only appearing in 1 set - 70800 Getaway Glider from The LEGO Movie - but this piece is ...