Prefilter for 1965 Volvo “Amazon” 122s

Link to product below; Showing off a prefilter I got to make the air filters last longer since they are stupid expensive and built as a whole unit. These are by outerwear’s and the size I got was 6” diameter by 1-3/8 deep(tall). I was to order again I would do 6” by 1-7/8” so that the elastic goes slightly around the top and bottom of the filter housing.
outerwears.com/search2.asp