If you look on ebay there is a guy that cuts the original down to your specs,but it's still like 100 bucks.DZ customs is the name I think.You can use a trailer fender,and cut it to your liking.They're around 28 bucks.Any trailer place has them. Northern tool,Tractor supply,etc.
They are strong too.
This one has about 12" cut off of it.I'm thinking once I get back on my feet about doing a complete bobber kit like on my bikes.For alot less than blue collar.