Has anyone purchased an aftermarket horn they are happy with for a 6-volt system? I see some listed-on amazon. They are cheap and have good reviews, but they appear to be about the size of a hockey puck and are mostly listed for motorcycles. One reviewer stated sounds like typical motorcycle horn. another reviewer stated he had a classic vehicle and was happy with it. good and loud? I am not sure what think. I have looked for a 6v horn but when I find one the seller wants $50-60 plus shipping. II won't pay that for a horn.