fastlane machine hardened drive cups

[xscrick]

do stock king motor dogbones fit?? I recently added hostile hubs and rovan extended hubs had to filed down to fit pin in on stock king motor drive cup,, didn't like fit,, so I ordered fastlane machine hardened cups and put in outside only with vertigo extended hub,,not tearing apart diff yet to put in the inside ones,, went together in 2 secs, perfect fit but anyway no matter what I try,, stock dogbones wont slide into the fastlane cups..
im guessing its due to machining differences between hpi and king motor??

 

[roadrashracing]

I have read that older hpi bones and cups are different that the new one ones, something in this ball park maybe?

 

[xscrick]

im guessing since the internals of the diff I have read are different in size slightly , that the dogbones maybe too,,, they cant be 5sc in size,, cause 5b/5t boots fit,,, im gonna get some new dogbones,, thinking about getting the phatdad 4mm crossover bones,, they should last the life of the vehicle,,,