Good news is that 6.5 x 1.5 is a standard size (not all SJ's have that advantage). A Fox Float R runs about $250 new and will work well (though no lockout or adjustable platform damping). Checking on E-bay, there is a Fox RP2 right now that would work. You may need to get the right hardware for it as well, should be able to get that from your Specialized LBS.