Thicker version:
https://www.ebay.com/itm/SORBOTHANE-SHEET-4-X4-x1-4-VIBRATION-ISO-RUBBER-PAD-30D-SUPER-SOFT-100mm/250446889012?epid=1531600931&hash=item3a4fcc4034:g:IhkAAOSwZjJU6qiN
..and then add these:
https://www.ebay.com/itm/SORBOTHANE-SHEET-4-X4-x1-4-VIBRATION-ISO-RUBBER-PAD-30D-SUPER-SOFT-100mm/250446889012?epid=1531600931&hash=item3a4fcc4034:g:IhkAAOSwZjJU6qiN
https://www.ebay.com/itm/SORBOTHANE-SHEET-4-X4-x1-4-VIBRATION-ISO-RUBBER-PAD-30D-SUPER-SOFT-100mm/250446889012?epid=1531600931&hash=item3a4fcc4034:g:IhkAAOSwZjJU6qiN
..and then add these:
https://www.ebay.com/itm/SORBOTHANE-SHEET-4-X4-x1-4-VIBRATION-ISO-RUBBER-PAD-30D-SUPER-SOFT-100mm/250446889012?epid=1531600931&hash=item3a4fcc4034:g:IhkAAOSwZjJU6qiN