Caliper Extensions for 'lipped' items like brake discs or lids

Woggin made an interesting design whereby one can slide two 'things' onto the jaws of your caliper and then can 'accurately' measure items that have lips, raised edges, etc. Like for example brake discs. The original design can be found here: https://www.thingiverse.com/thing:2946620

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However they did not fit my digital stainless steel caliper (bought on Ebay a couple of years ago - see photo's - I think it is almost