Hey, David, your TWA box should have one additional set of X-Brace adhesive pads inside.
If you ever need extras, please send us an email at support@tonewoodamp.com and we'll take care of you!
i used car number plate mounting pads, cut to size. clean the magnets theroughly with a non magnetic scraper.before applying.attach the amp and leave for a while, to settle into place.
David Weeks