Maybe here's another alternative
Z-366 TR - Gas Mono Shock Absorber
Price: (TR) $359.00 (TRL) $389.00
Available Lengths: 240 mm, 250 mm, 260 mm, 270 mm, 280 mm, 290 mm, 300 mm, 310 mm, 320 mm, 330 mm, 340 mm, 350 mm, 360 mm, 370 mm, 380 mm, 390 mm or longer
Type: Self Adjusting Gas Emulsion Shock
Features: Pre-Load Adjustment, Rebound Adjustment 60 Clicks - 36 mm 50 Micron Steel Bore and Radial Sinter Piston - 16 mm Hardened Shaft - Low Friction, Long Life Seal Block - Bearing and Bushes to suit each Model - Dampening and Springrates Model specific - (Optional: Ride Height Adjuster (Length Adjuster +10 mm)
Application: RACING ON and OFFROAD - for SOLO, SIDECARS, QUADS, CARS, STREET BIKES
Link:
http://yssusa.com/series-z.html
For those who want a reservoir please look at the "X-Series", what means it is the same shock, just with reservoir.
By the way, the spring rate for those two shocks with 80 N/mm is what the most here are looking for, not to forget the L-Types are lenght-adjustable.