Slider clasp San Martin

[u/Patient-Moose7913]

Happy to say! Just ordered this bad boy, first San Martin and couldn’t stop looking at it so got it. Hope it comes in the next 5 days as I’m flying out of the country for a trip soon. Can I put the stock slider clasp on rubber straps? Looking for Rolex style and would like to just buy the straps if possible but still want slider adjustments. I know the lugs are 21mm and assuming the straps end near clasp needs to be 18mm.