68 Barracuda K Member Questions

I have a 68 Formula S Barracuda Convertible with a 340 and the K Member cracked last summer. I had it welded in place but would like to replace. There are a few wonky issues I want to address and this is one. When I am looking for a replacement K Member, does any 68 small block Mopar K Member work or what specifics should I look for? I also have disc brakes, not sure that matters. The car is 90% stock and I am working to get it back to 100%. Any one have a beautiful one to sell and ship to CA? Thanks!

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Any pictures of this Crack? How bad is it ? Can it be repaired without removing it from the car ? It has lasted 55 plus years and your car looks great and I'm not so sure you need to replace or remove. I'm thinking repair it so it doesn't get worse. Of course just my thoughts you may disagree.