I just put a 2003 SCIII into a 98 Formula 500. I went and made tunnel templates to compare the differences between the 2. I had to move the rear mounting forward 13mm parallel to the angle of the foot well. This still requires the use of the SC10 III allen head bolt. I didn't want to drop it lower to use a hex head bolt and change the geometry. I swapped the top wheels with the smaller diameter wheels from my current SC10 to maintain track clearance. Then made a support bracket from 4mm bar stock to the outline of the rear mount. I added 2 - 6mm bolts 18mm from each end on the horizontal centerline to fasten the support on the outside of the mount, using button head allen screws. This keeps the new 13mm diameter hole location from oblonging into the previous hole, there was not much material left between them. If you use the existing hole the 13mm difference in the geometry will cause your track to bind up with the suspension in a compressed state. It parrallelograms to a dimension larger than the track will accept. The front remained same as current. It's a very simple change as long as you have the dimensions. The most time was spent gathering the dimensions and verifying the templates. Making the brackets and changing it out only took an evening and it works like a dream. No more sore back from the junk that was in there.
