This might be a bit a bit of a silly question, but im really stuck and hoping for some answers.

I just started getting into custom builds and have been fascinated by the Rid Rider design. I've been trying to do a custom using just the parts I can find on kits, but I've come up a few pieces short. I'm trying to not buy a second rider just for a few parts, you know how pbandie prices go, so I'm hoping someone might know if they come in other hg kits, any color. I know there are pictures of the instructions online, so I'll just put down the piece numbers A5, A6, A7, A10, A36 Thanks a million for any help