Once upon a time you could mix and match, t’ same dynamo and control
Box, yer could, swap from one make/model t’ another.
Nowadays you got t’ use t’ computer t’ tell compu’er it has one of them new fangled alternator things.
Some cars you have t’ tell t’ computer it got a new belt 😮
On them ones with the ‘Dyna-Starter’
Then the extra weight and cost of these ‘stop-start’ batteries.
Your stop-start special self starter solenoid to save 0.5 seconds on restart.
Dont think the 1985 Volkswagen Polo C Formula E had the extra solenoid!