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I.S. and disc brakes should be an option. They tell you there are option packages that are mandatory but don't give you options you can choose. If Keystone installed the disc brakes and i.s. it would probably be a little cheaper than aftermarket. These add-ons are becoming so popular that i suspect things will eventually change.As for as wet bolts, you could install grade 8 bolts with locking nuts on all shackles and they would probably last longer than wet bolts. There is a lot of difference in grade 5 and grade 8 bolts. There is no perfect suspension but I.S. is the best but much more expensive. Good luck.
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