Vinyl Aliens model help

[Bantha5]

I know we have some top notch models here, I was hoping I could get some help or be pointed in the right direction. I have this old Aliens model by GEOmetric back in the 90s. Problem is I have two fronts of the head but no Back of the head. If someone has this model and the back of the head, I would love to make a mold of it and cast a new back head piece. The original would be returned unharmed. Thanks Ryan

[KLAATU]

I have a spare part box of Geometric vinyl alien/predator stuff. If it's not too much trouble, can you post the instruction sheet that shows what the head pieces look like?

[Mikey]

I always wanted the Nostromo but it was way out of my price range