New performance super major

[wee blue tractor fan]

Hello. Not been on forum for a long time but decided to come on and ask a question.
About 20 years ago I saved maybe 10 old majors from the scrap man. Unfortunately they are lying in a corner of my farm slowly decaying back to nature. Most are majors or power majors but a couple are supermajors.
I'm sure when I got them I reckoned one was a new performance major but cant remember how to tell.
I'm sure it had something to do with top link draft fork on rear housing being different as it had 2 way draft .
Can't remember much about serial number etc so wondered if someone on here could maybe guide me?
I was hoping to build one up and thought maybe the Np major would be best to rebuild. Anyhow thanks in advance of any help !

[Old Hywel]

Well done saving them from the scrappy, whatever fate awaits them.