IDA mounting flange 55mm bore https://www.efihardware.com/products/1918/IDA-mounting-flange-55mm-bore
Flange for fabricating manifolds for IDA series throttle bodies or Weber side down draft carburetors
with 55mm bores. CNC machined 6060 T5 Aluminum. Bolt oles are pilot holes ready to tap M8 or 5/16" after welding.