Does anyone know the size of the rear top nut for a Xk8 shock with CATS?

I'm replacing my rears with coilovers, and the AVO GTZ Coilover shaft is the size of the Cats system, not the normal one, so my nut doesn't fit.

It looks like it's just a M12 1.25 pitch fine thread nut. I can probably find one of these in nylock with a washer, but is there anything special about the Jaguar nut? I mean it just holds the shock in the mount.

The Jag ones are like $18 and 3 days shipping. An M12 Nylock I can probably find at the hardware store.

I think this is the "special" one - but not sure. https://www.ebay.com/itm/22618539344...ampid%3APL_CLK

 

Simple nylock of correct thread should do the job. The CATS damper nut design is to accommodate the electrical plug.

 

Thanks! Suspected as much but wanted to be sure.