[deadtrend1]

Personally I would get rid of that setup all together, make a plate up and put a decent sounding 6.5" speaker in its place.

or

Find someone that has the stock 6x9 plates and put 6x9's there. Wont sound as good as 6.5's though.

or

See if someone has a original set they can sell. I know bonzo did, not sure if he still has them. Try to pm him.

OR

most expensive and least desirable way would be to find a set of 5.25 componets and just use the woofer out of the box. I wouldn't recommend it cause its not worth it.