One that fits............
Seriously though - you get what you pay for, and sometimes not even that. Keep that in mind when pricing anything.
Yeah, heatsink fins are a Good Thing™ - but only if it's mounted someplace that can take-advantage of the cooling. Or if it comes equipped with a fan or something.
For the life of me, I just cannot figure-out WHY the moto-mfgrs cannot adopt a regulated-field armature rather than a permanent magnet. The way they set these things up, they are all DESTINED to fail under too-much or too-little use. And the undersized, crappy wire, flimsy connectors, and cheap vinyl insulation they use on bikes....... You'd think the Japanese were copying GM.
OK, that turned-into a Rant. I'll just STFU now. When you find yourself in a hole, the first step finding a way out is to STOP DIGGING............