I don't know where you are in IL but I just picked up one at Tri County RV in Chillicothe north of Peoria. They where about $5 and handy for me. They are also a very class dealer that is extremely helpful. They also go over all their RVs with a fine tooth comb to make sure there are minimal problems.
Thanks KNMIB. We are just outside of Chicago, so that would be a drive for just a lens. We were tempted though. I was going to order 3 from Amazon, because I know this is going to happen again, but they wanted the full shipping price for each one, About $45 for 3 lens.
We got them on ebay for $16, (price plus shipping)
Beacher, You mentioned LED. Is there any difference in 1141 and 1157 bulbs. I know 1141s burn cooler but that wont matter with LEDs
Single filament - #1141
Dual filament - #1157
I think the OEM bulb is the #1141.
I myself have not converted to LED yet, so I would just put a small dab of clear silicone to keep the lens from falling off. But, if I had an LED with a 20,000 hour life expectancy, I might use a bit more silicone.