My understanding (based on 10 years of ownership and way too much time spent reading on- and off-line) is that all metal-bumper Panteras are generically called Pre-L (with a sub set of the earliest Pre-L's called button-doors). Metal bumpers (71 or 72) = Pre-L. Rubber bumpers = L.
Adam in SoCal...former owner of #1537, a medium blue 1971 Pre-L.
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.