We have a 2007 Bighorn and need to replace the two skylights in the bedroom and bathroom. Both of these have exhaust fans. We went to a Camping World yesterday, but didn't know we needed to know the correct hinge type, and had not taken the RV with us. None of the types they had allowed for the attachment for the skylight to be raised. It appears that the current lift is riveted into the lid. Do we have to order this type online? And, how difficult is it to replace? We don't need the fan operation, only the cover. We will need to replace one of the fan blades because it has deteriorated, but we found that without difficulty. Any help is appreciated. Thank you.