Have you checked online for the gas spring specialty stores? I found one last year but sorry its on my other computer, they had every type made, and all specs.
They are out there, Hopefully someone can give you more info.
Dan & Loretta, US Army Retired Aero Scout Pilot
2012 Fleetwood Providence 42P Class A/DP
Spartan Chassis, 8.9L Cummins 450HP