Based on dimensions for the Rucker Plates these should fit. I’m about to order 2 of them and put them in the single slot, stacked end to end.

ADD* referring to the 15 and 10 # sizes. I didn’t check the dimensions of the other weights

Yes4All Cast Iron Ruck Weight – Multi Weights Available: 10, 15, 20, 25, 30, 35 and 45lbs https://www.amazon.com/dp/B07XT4TXKX/ref=cm_sw_r_cp_api_glc_fabc_73J8Fb8RYEFT6?_encoding=UTF8&psc=1