I am not sure what fridge vent cover was used on a 1999 sunline solaris trailer camper. Normally we go based on brand and a photo, but because yours blew off we cannot do that. If you have a Dometic fridge and this one looks similar, you can look at the mounting hole dimensions and compare with the 3311236.000. Below are the dimensions for this vent cover. Dimensions:
- Base: Bottom Flange Overall: 25-7/8" L x 8-1/4" W.
- Top: 23"L x 6-3/4" W.
- Base Sits 3-5/8" H Overall.
- Mounting Holes for Cap Spaced: 21-7/8" L x 5-3/8" W.
- Cap - Overall: 26-5/8" L x 11-1/4" W.
- Cap sits 3-7/8" H.
- Mounting Holes Spaced: 21-7/8" L x 5-3/8" W.