Help! in locating parts for a T-Top

I am restoring daddys 77 dodge aspen rt and i cant find a site or parts company that manufactures these. i need the trim, seals for the t-tops. the glass is good still. i havent had many other problems finding parts for this car but the t-tops didnt come standard on this model, the were a custom option from the factory. i need direction. please help.