When you buy a used condenser,or even a new one for that matter off eBay,there's no guarantee they'll be any good.This is something that a lot of perople don't understand - a condenser can go bad from just sitting on a shelf.I bought a NOS condenser for a Remington saw back a couple of months ago & it was no good.I told the seller about it & he sent me another NOS condenser,it too was no good.
I've thought about using a Homie condenser.I'd just have to be sure of the Mf output & the length of the wire was acceptable as well.
Oh I understand, NOS electronic parts like that can be a craps shoot.
In regards to the microfarad rating, you're not dealing with precision electronics here. It's not a full sine rectifier, it's a crude storage device at best. Rough framing, not finished carpentry. Wire length is easy to fix.
If you want something new, I'd suggest hunting around for something from a small engine manufacturer like Tecumseh, B&S, Oregon, Stens... Trickiest part there would be finding something in the physical size you want, but that can be mounted anywhere if it won't fit where the original goes, just like a chip. FWIW on the 10 series, the chip will fit/mount in place of the condenser, and that will keep the mag blowing air across it with no other modification required (other than wiring).
https://www.jackssmallengines.com/jacks-parts-lookup/part/condenserGet it on Amazon if you want free returns.
A small automotive condenser would probably work too, again, form factor permitting. Might be worth a trip to NAPA? That way you could compare in person. Come to think of it, I need one... Might have to run over there this week!