I run stock height. I believe the PN 24-293471 is good for 0 to +1" on the RST. If you go to Bilstein's website and look up your truck, it shows PN 24-309516 for a Custom Trail Boss (which has a stock 2" lift), and also says it's good for 0 to +1". So if your truck is lifted it may be best to contact Bilstein for your best option.
The rear Bilstein B8 5100 shocks are now released. I just bought a pair and put them on my 2019 Silverado RST Z71. Made a big difference just having them swapped out on the rear. I bought Bilstein PN 24-293471. The fronts are not yet available.