These parts are specific to the MC21 model. Many other components which are used on the MC21 can be found on the MC28 page. If you have the part number do a search in the 'Quick Find' which can be found on the left side menu of this page. If you don't know the part number, you can check out the online parts book on www.nsr-world.com first before entering the part number in our 'Quick Find'. Best of luck!