Electronic Unit models

Hi, 

I have a Vespa PK50 XL HP (V5N2T) and I need a new "electronic unit", but I don't know the correct model in sip catalogue.

These two models seem to be ok but I don't find my vespa model (V5N2T) in the list "This product fits the following models"

http://www.sip-scootershop.com/en/products/electronic+unit+for+vespa+_85003000

or

http://www.sip-scootershop.com/en/products/electronic+unit+for+vespa+_86000000 

 

I have only 3 connections on my vespa..
Could you help me ?
thank you