need a rear gearplate fits #40 chain for 3 hole hub

[ludicrous speed]

need a rear gearplate fits #40 chain for 3 hole hub,the rim is off a scat cat/taiwan bike.
am looking for stock ratio or something close.
the model was the sc 114

im looking for new or used on the gearplate
and i could use another rear wheel and a brake assembly if anyone has one too.
they are 10 inch w a 3 bolt hub.< odd.
doesnt have to be perfect at all,flaking chrome no big deal.

see pics and thanks for looking.

 

[ludicrous speed]

if you know where i can find one new and can link me to it that would be greatly appreciated.