I would trust anything Bruce (Parts Dinosaur) has in his store. Just buy the whole set if you have to. Believe me, the LAST thing you want to do is get this thing back together and find that cylinder is low or makes no compression. As much as it sucks to spend even MORE money on this goddamned car, and as little confidence as you might have remaining - in your ability to work on cars or even your desire to even keep this one - this stupid little ring has to endure BILLIONS of explosions over its lifetime. Do you really want to take the chance?
I would buy the set from Parts Dinosaur and replace ALL the rings again. Peace of mind. Besides, at this point, you've got plenty of practice and will be able to install them PERFECTLY in about HALF the time. When you fire that engine back up, you can do so LIKE A BOSS because you KNOW those rings are done right.
A properly assembled engine with off-brand parts is often more reliable than the one hastily slapped together with expensive, brand name parts.
If it's worth doing. It's worth doing right the first time.