@1olbull I have tried that it when you select (rate) the only choice are standard or heavy-duty. Or I am doing something wrong.

Sounds correct to me.
What are you looking for?
This?
444 Series Shocks
Our 444 Series Shocks feature a proprietary patented Frequency Sensing Technology (FST) that has the unique ability to dynamically adjust damping as you ride; what this means is whether you’re hitting the small or big bumps in the road, the shock distributes oil through ports accordingly to soak up the hit making for an ultimately comfortable ride. A top mount threaded preload adjuster allows for fine-tuning with a simple twist of the cap. 444 Series shocks are available in 3 configurations: Standard (Up to 250 lbs.), Heavy-duty (250+ lbs.) and Super Heavy Duty (Touring Models only - 350+ lbs.).

Looks like a contact request for the SD is needed . . .
 
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