Its not a high-dollar collector car, and there are not enough vehicles around for a company to invest in tooling and manufacturing, which can be very pricey. Eventually, as the less desirable N/A's are either rusted out in junkyards or converted to TT and the number of vehicles dwindles, they may become more desirable and prices may rise. For now tho, most folks who have them are not willing to sink enough money into cosmetics to make it worthwhile for companies to get involved in repro parts other than some smaller items.
Don't bet me wrong-I would love to see greater availability of parts- but this is the sad truth.