I believe that's the folks I got the kit for my convertible from - of course I can't speak for the quality of the kit yet as it's still sitting complete a few feet away from the intended transmission, but I got it quickly.
I suspect that most of these kits are "assembled" with frictions from various sources. Key thing is to determine IF the kit's items are "at least OEM quality" items. Or if they have some "upgraded items" in them?
Automatictransmissionpartsplus.com and http://www.makcotransmissionparts.com are who I would have suggested but both sites appear to be down. They're the same company. They had the best prices and the service was super quick.
I should have mentioned in this post that I am looking for manual 3 speed transmission parts the A745 or NP745. Transmission Parts Distributors has a small parts kit and I have not found any other source. As to quality, who knows?