I use a March flip cap on the ocular on a Schmidt Polar T96. Not sure if the rubber bit is similar. I can take a picture later or measure it but I am always surprised that more people do not use March flip ups on their scopes. Firstly they are cheap but importantly they are really easy and quiet to use and seriously robust and well made. They are like a much much better version of the old Butler Creeks. Over the years I got tired of crappy Vortex flips ups and Tenabrex which are noisy and move about. I always like the Butler Creek option but they are just crap from a longevity point of view. Years ago I bought a March scope which came with their own flip ups made in the Deon factory where the scopes are built. It was immediately apparent that the Japanese had overengineers a simply piece of plastic which was lightweight but robust and simple. It was importantly also low profile and not bulky in any way.
March have schematics on their websites of various scopes they offer, so you can find out what the outer dimensions are of certain ocular and objective housings and match up the flip ups that suit those scopes. You just then need to cross reference those dimensions to your own scopes to see if they are a close enough fit. On the T96 for example, the wide angle eyebox flip up fits perfectly on the ocular knurled knob to the point where you can actually rotate it to adjust the ocular focus if you want but it never comes lose. It also provides a little extra shading to sun flare if you are using the scope with the sun shining brightly behind you. For the objective, the March 56mm flip up is marginally too large but a wrap of masking tape followed by a wrap of insulation tape provides the perfect snug fit with no damage to the scope finish.
