You'll have to measure the outside dimensions of the base of your 22 inch Blackstone but the most likely to fit MORryde Generator tray would be the part # MR89RR you mentioned which has inner dimensions of 17-1/2" long x 20-3/4" wide x 2-1/2" tall. view full answer...
The Replacement Clear Lens for Omega LED RV Porch Light # 328-89-319 is approximately 4-1/2" x 4-3/4" and is the direct replacement for the lens of the Omega LED RV Porch Light with Switch - 357 Lumens - Surface Mount - Clear Lens # 328-007-30SCPE.
I do recommend ensuring you have this exact porch light model as opposed to using dimensions in order to confirm the fit. I have added some links below to video reviews for you to check out as well if you'd like to take a look. view full answer...