try some kyosho plazma plastic in the front end, RobertK suggested the links, but it looks like the front end parts on the same tree are usable.
the only issue is i needed to grind the lower arm inserts a little. (an extra set of r5 inserts were the victims)
i suppose reaming the lower arm would be a cleaner solution.
The new AE 5.2 lower arms don't use inserts
They are countersunk on the outside for ease of adjustment, and better alignment
The stability, and agility of the OPC over the R5, is surprising
I did not expect that