Which video are you using? I don't know which scrap you are describing.
Not sure if a different video would help you at all, but try going for some of the other scraps first instead? Here is my video:
Originally Posted by 1001puppys
Are you sure the sub parts don't count? I can easily find out tomorrow night possibly if I finish up the stunt jumps and misc missions.
Submarine parts are not necessary. I think Nuclear Waste is though.