Audi 7A and 3B distributors

[mihai_antony]

Thank you guys for your feedback, it is very important.

After another internet/ebay research I think that the only difference is only the rotor, like Ruffiano said.
I found for sale on ebay a few distributor that are 7A, 3B, S2 compatible - if I read the seller subject and I look at the pictures. Also I found gear brass for sales that is 7A, 3B

At this site it is exposed a 3B distributor repair, again it looks identical to 7A

http://www.quattro123.com/Audi200DistributorRepair.htm

So? the only difference is the rotor? If it this is no pb, because I think I can buy a 3B distributor and install on my 7A engine

[mihai_antony]

The gear brass it was sold on ebay by 034motorsports, I think they are a trusted brand.
But I need a 100% confirmation before buying the dizzy

[mihai_antony]

3B - early AAN - 7A intake picture + some info from audiworld

"The difference with a 3B, is the width of the rotor arm tip. It is narrower to reduce the likelihood of 'crossfiring' to the 'wrong' post. I think it will work ok as is, but if there is a problem no reason a 7A rotor arm could not be fitted?"