Thomas , none reproduced in steel....sometimes you can find them , more or less banged up on EBay...I found one for a friend of mine in Arizona , rusty , dented etc, but a good steel filler , I think we lucked out for under $45, plus shipping.....
but after we got it here , using a hammer and a wood block for backing we got it almost perfect...then some rust removal, primer and paint....
but you cant find one brand new...
Ive seen some advertised here too , I think, but it might be a good idea to advertise for one under "parts wanted" while you search EBay...