You can find a cable slider in any archery shop, they are made of teflon and there are a lot of options. You'd better take one similar to the factory slider. If you go to a pro-shop, take the bow with you to be inspected - i have dryshot mine twice, but for more then 18 months after this i have no problems with it. You never know - one bow can be dryshot several times and it'd be ok and another will break from a single dryshot. Good luck!
2008 Martin MOAB - 45-60#, set at about 51-53# / 55#" Perfect Line" compound/ 55# Mongol horsebow/ 45# "Perfect Line" takedown recurve/ 45# Bearpaw Grizzly hunter recurve/ 55# Samick Longbow Cheetah ... and several homemade bows