I have the infamous seizing back window on my 87 K5 and after cleaning and lubing all the parts, I see that the problem is with the guides in the tailgate which are missing half the felt. Has anybody ordered replacement guids or felt? And if so, where might I look for that? I've done google searches but haven't come up with anything. The guides themselves look fine - I think I just need to scrape the old felt out and hot glue new stuff in. Any ideas?