Fuel Rail, BMW S54 can be purchased separately HERE.
20-0070-PK Fuel Rail Plumbing, BMW S54
The plumbing kits contains the items in the image below, and allows easy hookup with the factory feed line and regulator located under the car. This kit is only compatible with the E46 M3. E85 compatible.
-1x 8AN ORB plug
-1x 3/8" NPT plug
-1x 6AN male adapter
-1x PTFE fuel feed hose
-1x SAE adapter to attach to factory regulator