You can install modern RockShox mounting hardware into a modern shock from any other brand such as Fox, Marzocchi, DVO, Ohlins, etc, as long as both shocks have the same eyelet size, you just have to fully remove any hardware to get the eyelets "naked". If the RockShox hardware is modern, and the shock you are installing it into is modern and newer than 2017, then it will fit without any issue. If your new shock has white plastic bushings installed into the eyelet, those are known as IGUS bushings. Those are commonly used in Fox, Marzocchi, DVO and Ohlins shocks, and is the inner-most piece of mounting hardware for those brands. However, RockShox mounting hardware uses metal DU bushings as the inner most part of the hardware. You will need to remove the plastic IGUS bushings from your shock to get the eyelet "naked", meaning there is absolutely no hardware installed into the shock's eyelet. You can remove that hardware with a small flathead screwdriver in between the center of the bushings, and using leverage on the handle to pop them out. From there you can install the RockShox mounting hardware into the shock eyelet. First, press the metal DU bushing into the naked eyelet, and then you can install the rest of the hardware from there by simply pushing it in with your thumb.