I had a problem trying to use these mounts with a D817t, they don’t mesh up at all with a 50t spur gear, which is standard on the truggy. I running a 50/13 and none of those mount adjusters work at all. I have all of them no.1 through no.3 and the number three turned to the tight side has almost a 1mm gap. And for 1’s and 2’s you can forget it, and if the no.1’s were made for 48/13 I couldn’t get them to mess with a 50/13 to far out. For the record none of those mounts Work at all, none of them, on the Truggy. For the price of almost $200 for the most expensive engine mounts ever in the history of RC car Watch out on the d817t.