Any locking gas tanks caps that are compatible?

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Gas cap

Heck just go to ebay min chopper parts/ gas tanks get a 2.5 or 3 gal tank with a locking gas cap just make sure the tank has an indentation for you cross bar some of them don't. and you can get some hot looking tanks there that is where we got my hubbies tank from and it matches his bike.

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I've put on our kit a cap from a Puch, as well as from a Garelli TopTank. From previous experience Tomos and Garelli cap are interchangeable as well.

I've order parts from Chris at Moped Warehouse (above link) and it went smoothly, but I certainly couldn't vouch for him or his business practices.
I can however say with confidence that Dan at 1977 is a most excellent guy to order from. He's helped me out on several occasions and has an undeniable passion for mopeds. I like to refer people to him simply because I enjoy supporting smalltime business owners who love what they do. I would recommend calling him though.

There are a few links I posted in this topic below:

http://www.motoredbikes.com/viewtopic.php?t=342