P28 Air filter cover.  You will need to cut a gasket out of gasket sheet.  You will need a filter that will need to be cut to size.  if you don't have The original stud you can use 1/4-20 stud or equivalent.

Gasket sheet. https://www.summitracing.com/parts/fel-3195?srsltid=AfmBOopbUvelmz3gWr3lbiTPuoekrIIWN9BdLYb1KlVvjr6h_LI5WvLqmWo

Filter. https://www.summitracing.com/parts/RRA-7-083079