here is a 3 piece set up that member streetkit has in the SB for sale section and may indeed work on your car also(which would be way ez if there is enuff room to use it at the firewall and is much better sooted for 2-v to 4-v swaps)

i bought this set up for a 440 truck from member streetkit,same price.

if all else fails you could swap it to a 3 piece set up.

what you have is a one piece set up,they dont go by how many piece are on the bracket like yours...its 1 rod or 3 rods 2 bellcranks

i have all most a full set and the other rods could be made up from scratch..I have done that befroe as well.