Adhesive Rack Unit Indicators?

Hey there folks, In the past, I've seen rack posts come with their rack positions labeled, from the factory, 0-40 or whatever, for recording what "U" a piece of equipment is on, starting with 1 at the bottom and numbering every 1.75 inches as you rise (i.e. every 3 holes). I've also seen the low-tech version of this (aka "A Sharpie") used extensively. But I could *swear* I saw some company that just made an adhesive strip that you could put into your cabinet that made this simpler, and perma-labeled your rack, but either I'm hallucinating, it's no longer made, or I've gotten worse with google (or the AI summary and reduced results are failing me). Does anyone have recollection of such a beast? -Dan