Solex 40 P11-4 x 1/2" thick CNC milled aluminum (6061) mounting flange / spacer. The holes are just over 5/16" so will fit over 5/16" or 8mm studs.
If you are fabricating an intake and would like one tapped for 8mm studs I can make that as well for an additional $5 each.
I do combine shipping so if you buy multiple items, let me send you a combined total.
Custom work available, just ask.