If I were looking, I wouldn't bother. What are the chances of finding
16 (or 32) of the same bearings? So they're common - that doesn't mean that a mechanic will have a pile of them. Why would he keep them? Pull 'em off and throw them in the trash. I suppose that you might find a mechanic who wouldn't mind your going through his trash. And you might find a couple. Do that 8 -16 times and you'd have them. Not me.Maybe if you tried you would find what you seek,
Have *you* ever gone to a mechanic looking for something like this? I have - it only took a few tries to get the message that they don't keep old parts and/or don't want to be bothered.
YMMV, Bob