X 2 on the Pioneer 872037. I've used them for years including the one on my current internally balanced 360 that's been going for over 4 seasons.
Shop around for best prices, but Summit has free shipping.
http://www.summitracing.com/parts/pio-872037
(Disregard the pic they use. That's not it. This is.)
If you don't care about the price, this is the best you can get:
Innovators West $375 plus shipping