good luck. i spent about 3 months trying to track one down for my build before giving up. I did find a couple people across the forums and facebook that had one but all very reluctant to sell so extremely expensive.
In the end i got a standard 530 off a B230FT with the plan of porting it out. a ported 530 can flow better than a standard 531 with a bit of work but a ported 531 wins overall.
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