New Dometic AC 1988 dolphin 22re

[RICHARD SCHADE]

I just installed a new Dometic ac unit on my 1988 dolphin and tighten the four corner bolts to Dometic spec. but the roof bumpers are not touching the roof, its mainly supported by the gasket ,water hose tested it no leaks,would have to tighten 3/8 to 1/2 inch down on gasket for the bumpers to make contack, but new unit is a 2011 model and the compreser bolts are boled through the base , the bolt a washer, and a rubber gromet , and if I tighten more the heads of the bolts will also hit the roof, they are about 1/4 inch off now, has anybody see a problem with the way it is , it run find. the old unit was the same Dometic 13500 btu but see better days build in 1987, and someone tighten it down to where the gasket was a 1/4 inch thick, and sealed the hold unit to the roof all the way around , witch from what I know is worng. any input would ease my mine.

thanks Richard