I tried one of the after-market 14.5V VRs a few yrs. ago - don't recall the name. It was not Bosch. The brand has been discussed here numerous times. I was after the same thing you are.

The darn thing didn't fit right.

Decided to simply replaced the alternator which comes with a new VR - Bosch alt. My origianl was 80 amp. Bought a 100 amp Bosch unit.

Lo & behold. I started seeing 14.30 at start-up on a cold motor vs. the original 13.90 - 14.05.

Just my 2 cents.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"