This is not a mandatory item but it looks good. It stays tight like it should. I have a different brand plug for the trans side and I have issues keeping it snug to the point where I have lost fluid during a ride. This one is the way to go.
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Just from initial purchase and install - will add a review down the road on how the finish holds up. It is a (red) color match for the CRF250R I put it on and it came with the O-ring. Finish held up to the light torque of installation w/o chipping. Great value, too.
Really adds taste to your bike, and brightens up the motor and makes it look trick. My one complaint is it seems slightly easier to strip, but its not much of a problem if your careful. Worth the price and worth the "bling" factor!
I do know the oil filler cap on some Honda's 4strokes is the same for the Transmission. The easiest way to figure out if that's your case is to try your oil plug on the transmission plug. If it fits than you can order 2 oil filler plugs, one for the oil and the other for transmission.