Product review (5 stars): Very quick replacement
Fit  perfectly into my 30+ year old Jenn-Air downdraft.  The old cartridge got broken by my teen age son and I thought that I might have to replace the entire range.  My broken cartridge said A122, and the A122B is black in color which worked for me.  Slid right in in less than 30 seconds once unpacked. It had allot of protective packing that is a great idea.  Looks the same as the old one, but uses more modern heat elements under the glass that seem to heat a bit faster.  Really good price for this OEM.