[Brian]

i just picked up some of these at Home Depot. They are similar to what Lowes has but much cheaper.

http://www.homedepot.com/p/Crown-Bolt-3-16-in-x-1-2-in-Black-Neoprene-Washer-4-Pieces-89178/202210299

I only replaced one so far since that is all I needed to replace for now. It seems to be working albeit the fit is a little loose.

Brian