Evil has used them, says that they're OK. I'm sure there's no difference.
The bird ($50 more) says OE which is
it's made RAUCH & SPIEGEL to me they're aftermarket. An NOS one easily fetches over 6 bills.
Evil likely has one in stock, if it's the same price I'd get it from him.
You could try a WTB someone may be sitting on a good used one.