Sewnoma,
I need one too. Our 185K came with a hole burned through the top of the housing. If I could find one with a broken mount area I could fix mine.
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The only one I have found to date was a complete unit on eBay. I missed it so I'm still looking.
As far as just the lens and spring I've never seen any loose for sale.
Those lights will work OK without the lens in it.
Joe