I agree with Debby and always took mine out at the first tire/tube change. However if you want to have rim locks installed they are classified by rim width on the "WM" scale, which is stamped onto the rim, look for WM3 on the rear and WM2 or WM3 on the front.
Rim locks are largely vistigal, going back to when motorcycle manufactures only made one type of machine, currently refrred to as "standards". These standards were morphed into dirt bikes, cafe racers and touring machines, by their owners. While I was in college I worked at the local Triumph dealership; we had a customer that converted a TR6 into an enduro bike and ran 10 PSI F/R, he had two rim locks in each wheel; he always brought his bike in for tire changes, I, being the "apprentice", got to do the changes: I HATE RIM LOCKS!
RS