if there is not one readily avail you could get yours welded, probably quite inexpensively.
worth a thought; I am finding that machine shops are not too bad - and I am really getting a tour of them!!!!
is it steel or aluminum? (magnet test if you are not sure)
what part of town are you in? Worst comes to worst I could weld it but you will have to sign a 45 page indemnity agreement first
!!!!