I was running the earlier model SU HIF 44 carbs and have just fitted a later model set last night to find that the linkage to the mainafold is different

Question I have are:
1. Is the early 3.5 inlet mainafold the same as the one used for the later model SU HIF44 Carbs?
2. Old carbs had a bad leak out the drivers side carb from the float bowl, am I better to fix this and refit them or go ahead and get the linkage sort for the later ones?
3. It looks like it's a Roller fitting that is missing, is this all I need and will it fit on the early inlet mainafold I'm running?
I have our Club trials next weekend and really would like to be there

Cheers
Brett