I just replaced the outer beltline strips (window scraper) on my C/S with a generic part from JC Whitney. Its not QUITE the same, but looks factory once installed and only needed to be trimmed to fit.
I chose style 42 (link below). It comes in 48" lengths, so on a T-top car you'll need to cut off about 4 inches. No biggie. Basically you pull the door panel, remove the window glass, unscrew the old stripping being careful not to drop screws or the hockey stick moulding on the outside. You can get away without removing the moulding, BUT have some way to hold it up. It WILL break on you.
Lay the new piece in place, mark it with something, cut to length, drill holes in it with an 1/8" drill bit, and put it all back together. Style 42 has a chrome top, which I didn't like at first but it doesn't look too bad. With a little convincing and gentle tapping, the chrome can be used to cap over where the outer moulding meets the door skin for a nice clean finish.
I'll get some pictures up tomorrow hopefully.
Looking at the JCWhitney site, style 39 might work well too and give you a little more material on the top to cap over everything with.
link to part: http://www.jcwhitney.com/autoparts/I...D:100000225814