More info- my gas Koni shocks are #30-5436 as sold by D Quella in Co. They still list them on www.koni-na.com along with their current catalogue etc. Since my Pantera is 600 lbs lighter, I use 2-1/2" OD 275 lb front springs & 350 rears and the car does not bottom during open track events. These shocks are pressurized to 300 psi so add 40 lbs to your springs to account for the assistance from internal gas pressure. I had to go to the POCA Archives to retrieve the article I wrote Aug 2008 on installing them, just before a 500 mile road trip with an open track at the end.
Note they are NOT specifically for a Pantera- we are far too small a market for a special shock! Therefore, there's some minor fiddling to mount them where the stockers once fit, but Quella supplies all the necessities. I think frt & rear shocks are the same but the bump rubbers are different.
These are steel body- Quella says each aluminum body equivalent is 12 ounces lighter... for $300 more. The 4 steel assemblies save 26 lbs over stock (29 lbs for aluminum) and will work upside down- which makes ride height adjustments easier. They do not use jam-nuts on the adjustable ride height nut. Instead Koni uses a pointed-end setscrew to lock the single adjusting ring-nut. All spare parts are individually available from Koni-North America in Kentucky.