I measured 8 parts.
4 of them I already sold.
Now I have 3 shorter ones and one longer one.
All have "LEGO" loho marks on bottom and "C" mark oon top. Theese
parts has also different holes locations than previous ones so we can figure
out that:
1. there are 2 different lenghts of part
2. there are at least 2 variants of holes.
[...] The holes in them are also different. How many have you measured? It could be that there are more variants all differing very slightly in length. (14 months ago, Apr 20, 2023, to Catalog Requests)