ya, sorry, the 51t is not on their website,,, they say over half their stuff isn't on the website.
I run the 15W only because it should last longer,,, even though this 15W chain broke a plate in about 1000 miles. I'll check the rave cable too, & I should also change the bearing on the jackshaft/clutch side, as it's a little ruff,,, It was nice to be able to spin the shaft without the chain and belt, but too bad the bearing was found to be a tad ruff and "catchy" (LOL).