I know that I am a little partial to 4WD Hardware, but they area also a good source for parts. I'd imagine they have any adapters that you are looking for. You can find them on line at 4wd.com and then when you get tired of looking at their site, just call them (I'm quite sure they have their number on just about every page on their site) and talk to a tech dude or dudette. They are normally quite eager to help you.
Let us know what you find/figure out.
91 Jeep Wrangler YJ, carpet, tires, trailer hitch. yea....