Product review (4 stars): Good replacement rings
Good replacement for my old Whirlpool RF4900XL range. Both of the large size rings I got were slightly warped and had to be bent a bit to lay completely flat.  The small rings didn't have that issue.

I also purchased the matching Series E drip pans which fit fine but the cutout for the heating element connector was larger than the original, but they should work fine.

For both the rings and the drip pans the metal seems thinner than the originals (not a big surprise though).