I used to have a 89 260E, now a 95 E320. According to the owner's manual

89: 260E, 300E/300CE all have 70A alternator
95: E320 has 90A, and E420 has 110A

Is the 80A alternator for another model year? Will the 90A or even 110A alternators just as easy to retrofit for the older 70A one?