What kind of vehicle are you working with where a 3/8" change in the radius of the balancer is going to make a difference? That doesn't make good nonsense! If crossmember clearance is an issue, just shim the motor mount up a little.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!