Aluminum Flywheel for a 87 RX-7?

[Tank_T_Great]

i have a 87 Rx-7 and the ring gear around the flywheel has came off, mazda motors company has very few left that i can get my hands on, for a ton of cash, im thinking how can i make a bad turn into a good, so im thinking a lightweight performance flywheel, but i dont know of any companys or places to get one for such a rare car with a rare engine. so im wondering who might have built up a Gen.2 RX7 and possibly know a good flywheel for me so i wouldn't have to Replace my original flywheel with a OEM style. so any imput i can get would be of great help