Here's the link, hope it works, some info from when I did mine
Fuel filler caps (aero), Web site looks kind of cheesy but the product quality is excellent, good stuff. The “Aero 300” fits the shock opening perfectly…. 3.70”, some have went with bigger. Do not even think about using one of those Aston/Monza caps on your Pantera as it is a violation of the basic “Man Laws”
Batinc
http://www.batinc.net/main.htmInstall pics
http://pantera.infopop.cc/eve/forums/a/tpc/f/7650045562/m/6230060104/p/1