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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I have an original 70 340 swinger "K" frame for $100.00 and upper and lower control arms w/ sway bar another $100.00. In Florida, will not ship, sorry. I do not have to sale it, but willing to help out a fellow Mopar guy to get their car on the road.