P4 and I believe P6 both use the same conrod as a V1 fyi
There used to be a dude in Seattle that ran a scooter shop called "Hodgespeed", and he had a few of the P4 conrods and I've had them pressed into V1 cranks and run them because they are the same :)
That shop doesn't seem to be open anymore tho as of like a year ago :/