It fit just right like everything I get from Sears they have excellent products
I have several older Craftsman shop vacuums. These units have filters with separate cover plates that hold the filter in place. They unit has a threaded stud and a hold down nut that screws onto the plate and holds the filter in place. The hold down nut has a sort of flat lever handle attached on one side used to turn the nut. The new replacement filter has an integrated cover plate with a raised center ring presumably for newer vacuum designes. When I tried to screw on the threaded nut as shown in the instructions (with the lever up and away from the filter), I could not get it to catch the threads. I could only get it to catch if I flipped the nut over (with the lever side down towards the filer). This caused the integrated ring in the filter cover to distort and crush a bit. The fit was very poor. I did verify that the filter number is correct for my vacuums. The old design worked very well. If you have an older unit with the lever type of nut you should try to get a replacement filter with the original design using a separate cover plate.
This filter works as good as the original filter.
Having to cross reference websites to see if this filter would work for a 20 gal was time consuming but it does work for it. Asking an associate was a waste of time to get an I dont know.