I'm not sure what yours look like but when I replaced the ones on my 1979 260 DA I just went to my canvas guy and got some SS pipe. I then measured my old ones (They were cracking) and cut to length. I then placed the ends in a vise (wrapped in a towel so not to deposit cast iron into Stainless) and compressed. I also bent them to the proper angle using the same procedure and rounded the edges on a stone grinding wheel. I drilled the holes with a titanium bit and installed them on my boat! Hope this is helpful.
Todd