Alternator 164 or 245? With aircon pulley
 

If you know which, add to the thread. It's definitely Bosch and Volvo. I kinda think it was the 164 because they stopped bothering with machining and coating the laminate plates on later alternators. Either way, if you're not a purist then dump that mechanical regulator and fit an alternator with built in transistor regulator and a bolted on main cable direct to the battery. Note: it has the twin front pulley. I think one will line up, or they can be swapped with single + spacer off your old alternator.
Mike

looks exactly like this one that sold on ebay

https://www.ebay.co.uk/itm/ALTERNATO...p2047675.l2557

listed to fit
240, 2.0, 2.8, 1974-1993

260, 2.7, 2.8, 1974-1982

760, 2.8, 1982-1990

780, 2.9, 1986-1990