Nope, just call the custom shop and ask for them, they just replace the cap with the top left piece while the silver tower fits into the turret slot to allow for external adjustment via the top right numbered piece. The bottom part is the zero stop bump.
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They come in single turn w/ zero stop or in multi turn w/out zero stop.
If you don’t put the top numbered cap allllll the way down on the single turn zero stop model but just up a smidge you can still feel the zero stop bump but you’re able to slide over the top to get more than one revolution.
They were like 70 bucks when I got them a few years ago, not sure what they are now.