Buttys looks like a replacement for 4/7/10, I was looking to replace these with stock but this looks better so thanks for link.
As for the bits I need I'll do as Apollo and replace with steel bar and roller bearings.
I was cutting out rot on chassis outrigger and maybe got over zealous and should have checked availability before slicing through linkage. It wasn't in best of condition so shouldn't be too hard to improve it.
Thanks guys