So I'm thinking you might have to redrill the holes in the tunnel. Probably up and forward a bit. This would maintain the same approach angle of the track. If you use the existing holes, the front of the suspension will sit further down, which would give you less ski pessure. The limiter straps are the same between models. You must have a 440 xcr arm. The 600 has adjusting bolts for the straps. Hope this helps.
SWRules