Mine was a '72 SN3242 pre L and seem to remember it was the early model valve with the bent rod so I have not seen disassembly of the later model. Hope someone else can help or maybe if you disassemble yours you can measure and order from the same company as I did back in 2013. Good luck!
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.