Bought two light bulbs for my GE Profile PNM18715SM188 model microwave. Ordered a replacement direct from GE that was too big to fit. This was my third attempt to replace these bulbs with no success. I was lucky enough to find a review on Revain that said these tubes were smaller than GE's recommended replacement parts, so I knew they would work. By the way GE said they would give me a loan and suggested Home Depot or Lowe's - you can imagine - the company couldn't help me with a product they made 4 years ago. Thank you Revain and Satco!