Help with old Yokomo
 

Hi guys. I have a Yokomo MR4 BC that I have run a few times outdoors at a local club. I found out that there was a long wheelbase conversion available, as the car is based on a TC chassis its a bit short. I could not locate the full kit, but managed to get hold of the plastic bits. It needs a rear hinge pin brace which I cant find, but that can be made.
The trouble I have is the hinge pins. They are 2.3mm diameter, and approx 48mm long. The conversion kit looks to come with longer ones. I have been looking around, and the nearest thing I can find is some 2.2mm drill blanks that are 54mm long, which will probably work. Also 11 AWG piano wire is a tiny bit bigger diameter, but no luck finding any. Can anyone help? Drilling the wishbones to 3mm might leave them a bit thin, 2.5mm would be ok if I can find some suitable pins or wire.
Thanks for reading :-)