Rubber Rings on an "L" lens

I bought a 20-35mm f/2.8 L, but because of it's age, the rubber rings have come off. Does anyone know how I can replace them? Like what do I buy, do I turn it into a camera store?

Oh, and I had no idea where this was suppose to go, so I put it here.

Thanks!

Have you tried contacting Canon parts?

Time to go upscale! A little alligator skin pleather should work nicely.

you just bought it and the rings fell off on you? so did the seller alert you to the condition?

Yea, he did. It's because it's an old lens, and plus, I got it for a really nice price so I had to over look the rubber rings.

I contacted Canon parts and they had it, the big rubber ring. And ebay has the smaller one, so I'll just have to buy both.

Sha..Bam!
Search ebay for 320385233470
I've bought (And locally picked up) from these guys. They've gotten the parts for me to refurb several rebels.