I doubt you will find just a used lens as most guys will want to sell you a complete gauge cluster because if they sell you just the lens the gauges underneath are now unprotected.
Check ebay for a complete cluster if you have not already-that is how I have seen most of them for sale. Even if you don't see a cluster for sale guy selling parts to fit your tractor my have the cluster you need.
From my experience the guys with the used stuff(brick and mortor locations-not eBay) want almost what the new stuff is running.
