OK I bought a 91 Si parts car complete wanted to use the Si door panels in my DX but the drivers side has a hack where the seat belt hit the door panel how would I fix it and would it be expensive?

 

if the puncture is in the textured plastic part of the door panel, check out the Eastwood site:

http://www.eastwoodco.com/

and look at their vinyl dashboard repair kit. Depending on how big the wound is this should help
you fix it. It is basically a small flat iron, which you use to heat activate some vinyl repair compound
that you mix to match your interior colour. You choose from one of the supplied texture sheets
and heat the repair material through it, thus leaving a permanent patch which will match closely if
you take your time. You may be able to find a similar kit in your local autonotive place though.

good luck