it's the same thing. the reverse light socket is on that OEM black piece, so it doesn't matter which reverse light housing you have.
stock is the brightest, there are LEDs that are as bright as stock, so that wouldn't help you. if you want something brighter, i would suggest you make an LED array with superfluxes. that will make it brighter. but that's no simple bulb change
as for the size, i know because i've actually changed them out on various cars. i know lighting pretty well, i'm no lighting guru or anything though, so hopefully someone here can give you a second opinion so you can confirm.