M30 TPS Adapter + sensor by Lockheed set
When you trade your motronic for a more modern engine management system it is highly likely, that a TPS will be needed in place of the idle speed/full throttle switches originally on your intake.
The set includes the aluminum adapter, appropriately sized bolts for an easy install and a TPS made by Delphy with part number SS10562 (OEM BMW number is 1363 1721 456 or 1363 1726 591)
It will fit both early and late M30s, probably a lot more vehicles outside the BMW line too.
You can buy just the adapter + bolts if that suits you better.