I've developed an adjustable foot option for the CSSU shelving. These feet can be speced as an option to replace the PVC-capped feet. Depending on the wood used, they add between $5 (maple) and $8/foot (walnut, mahogany).
Ask about them when designing your CSSU shelving unit!
CSSU adjustable foot shown in walnut.
CSSU adjustable foot shown in mahogany.