I just got a pair of Polk EX3560 speakers for a great price on ebay, but I can't seem to find 1" spacers anywhere. Anyone out there know where I can find them?

 

I made mine out of 3/4" MDF.

Copied the factory speaker mount pattern, cut them out and mounted them in the door.
Worked like a charm.

 

I installed my JL XR components yesterday and ran into the same problem as you. My fix was to put the stock speaker on the floor magnet side up and step on it. The whole speaker and housing broke off cleanly and I just mounted the new speaker to the factory spacer. No new holes in the door needed. You just can't ever want the stock speaker back.

 

http://www.audiowarehouseexpress.com

Part number SS65. That's what I ordered. I have not installed my speakers yet so I cannot say for sure if it fit.