The outside part of my range vent on my Jayflight SLX 267BHS fell off. I have looked for a replacement on Amazon and they are all too small. The outside dimensions of the vent are 12 1/2 by 5 3/16. Any ideas on where to find one. I haven't tried Jayco because I don't want to pay 2 or 3 hundred dollars and wait 6 months.