Was looking for a single sensor alloy flange, I found them at Dieselvw.com ( Prothe )
I bought a few , great quality for 5.00 each
You will need a 3/16 thick oring
ace hardware
I also bought the rear side , it showed alloy flange on tere website, But i was shipped plastic with no sensor attachment
I gave them a call and infomed them to get the alloy as shown...
GB