They should be A127i-100amp for the 300 TDi. The difference was in the size of the pulley on the front, hence there are two lengths of drive belt as well.
I have two main alternators listed for the 300 TDi, the early ones were
AMR4248 and from VIN VA534104 the part # is
AMR5425.
Now, whether they have now combined the part numbers and you put the pulley off the old alternator on the new one or not I don't know. Maybe worth asking though, just to make sure you're getting the right part.
Paddock Spares still list both part numbers.
