Justin, you are absolutly right, Helicoil is also common here in austria too, it looks more like a spring thing, rather than those thread inserts, but works like the same!
Nice finde too...
Parcel should arrive tomorrow, or latest on frieday, i'll post some pics when i get the bosscat and parts, may i can ask the previus owner, if he knowes from witch factory the other chassis is!?
Thanks all for your help.
Mike