Here’s what I used on mine. Works great! At 20mm long, they are just about 1mm longer than the .750" bearing stick-out (look at me, mixing mm & inch in the same reference. 
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https://www.amazon.com/gp/product/B07SSP5TV4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
