I have some plastic pieces for my 4 door wagon that are a little brittle. I'm afraid that if I install them, they will break.
There are no mfg's that make repro replacement parts, thus things (primarily the rear seat bumper covers)are of great concern to me.

Does anyone know of a way to repair pieces like this?

Most interior repair technicians can do a very nice job of it. Should you need one, it not likely that there will be any in your yellow pages. most are independent or franchise owners that do work for dealerships. As an example here is my site www.mobileautorecon.com (http://www.mobileautorecon.com) , there are also several bulletin boards out there similar to this one. Often times the easiest way to find one in your area is to talk to the Used Car Manager at really nice car dealership - he will have one that visits his lot for repairs most likely.