the skid is a good upgrade. track fitment is the issue and you have other options. the template probably wont help as it was used for a relocate of an existing skid for the longer track. that principal works well in that given situation, doesnt apply to your situation. things to consider on your pending project is track to bulkhead clearance with the different pitch track. the stock mtn srx 8t 2.52" drivers are around 20" circumference and the 7t are at 21", so even by dropping down to the 7's, your adding an inch, basically 1/2" add the extra lug height of another 1/2" and your out of room without a drop and roll or chaincase extension relocating the driveshaft. you can place that 153 skid to accomodate 155's in a 2.86 pitch, or the better choice of 156 or 159 in the 2.52 pitch keeping with a 2" lug.