The feet for the MX-110 are factory Part Number 01715600. They are available from the McIntosh Parts department at (800) 538-6576. If you want the higher foot that part number is 01721800.
Mark
McIntosh Authorized Restoration & Warranty Service Facility
Phone: (952) 894-5580
Fax: (952) 456-4937
eMail: McIntosh@AbSoundLabs.Com
If you order packaging from Audio Classics, a set of taller type peg feet with be included. These should be used because they will secure the unit better in the cutouts of the skid plate.