For 64p gears, I usually use the thin machined spurs from CoreRC, Titan or ARC. Leespeed are another good choice. I think the offset xray spurs were originally made for an older car that required it to be offset?? Not sure on that. I bought my first xray in 2011 and offset spurs have never been a great option for any of the cars I've owned. They will work, but will always be extremely close to one side of the top deck. Not ideal. The 48P spur that ships with the kit isn't offset. Odd they don't make any lower tooth count 64P gears that are centered. Just go for one of the brands I mentioned above.