Odd flex plate help.

Got a hold of an industrial motor with a billet crank off a generator that has some weird sizing on the crank. The center hole diameter is 2 1/2' inches and the bolt hole size center to center is 4 1/4'. I have a stock ford flexplate and torque converter here to go a c6 and while the torque converter is good I can't find a flexplate like I'm hunting for. So, my question is, does any one know where I could find either a place that sells flexplates and lists the sizes or a place that custom builds them without breaking the bank?

Your best bet is to get a passenger Car or Std Truck motor if your looking for do it on the cheap.

For reference the 429 industrial cranks are forged not billet.

Dave the Industrial cranks I have seen have all been Cast so far, the only ones I have seen Forged are the F600 Truck cranks