Don’t get price reamed with "Audiophile" feet, just get some of these Sorbothane discs or pads in the size and shape you want they range from very soft to hard durometer density for different weights
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1312.R1.TR3.TRC2.A0.H0.XSorbothane+pad.TRS1&_nkw=Sorbothane+pads&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=Sorbothane+disc
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1312.R1.TR10.TRC2.A0.H1.XSorbothane+.TRS2&_nkw=Sorbothane+disc&_sacat=0
Cheers George