I don't know why but the picture just says it's compatible with DW421; However, when I received mine there were 3 others on the list (see picture). This replacement fits: DW421, DW423, D26451, D26453. I bought it for Dewalt Sander D26451. I have had this grinder for over 4 years now and it has taken on every project that I have taken on and has done a fantastic job. I love my grinder, but recently I was going through some pads while working on a kitchen table I'm building and to my dismay the…