So, I checked with the company and they are ok with having their name published here:
https://www.craemer.com/But again - use this info to search for the pallets online (e.g. e-bay) but don't bother them regarding the original pallets as there aren't any left.
The last ones they had have been recycled in the 90s and the two samples they have left are of the 70s version of the pallet and the ones used on Aliens and Star Wars were the 80s version.
The designation of the pallet was C4B (yes it sounds like a SW-Droid). The part number for the brownish-red version was 81321711 though it is unclear if that's the number of the 70s or 80s version.
The white version had the part number 81321111.
Here's a picture of the label on the pallet:
Attachment:
Pallet_1971_Label.jpg [ 273.93 KiB | Viewed 1692 times ]
The C4A pallet looks quite similar on first sight and should be quite easy to modify into a C4B - but again no stocks left.
I hope this helps.
Cheers,
Stefan