on 4S that is..

What is your budget? you could set with a 7/8XL, but if you don't mind spending a few bucks; the Lehner or Neu would be a nice alternative..

I have an 8XL for one of them already. I was looking through Mike's store online and was thinking maybe the Lehner Basic XL2400, Neu 1512 2.5d/f or 1515 1y/f. I figured with the weight of the LSP-R, any of these should work ok.