Looking through my kit car catalog, its shows those both as P prefixed parts. P parts don't always show direct interchanges with regular production parts. I tried to find those numbers in a Hollander interchange and was unsuccessful. I would suggest just trying 3/4 ton truck parts, but I can't imagine those would be any easier to find in Germany. You always could try calling Petty's Garage directly and speaking with them about the interchange. They were key contributors to the Kit Car program on top of all their previous association with Chrysler. 00-1-336-498-3745