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I believe the only place you will find a fitted cover for a 21 Smoothside is Mills. Contact Bob Mills and see if they make one specifically for the Smoothside.

In 2004, Mills designed a cover for the 21 Ribside using my boat as a pattern, since back in 1971-1979 when these 21's were being built, Whaler never ordered a cover design. I believe the same cover that fits the Ribside will work on the Smoothside, with alterations at the stern. I do not know whether Mills has ever sold a mooring cover for a Smoothside. But the one he did for the Ribsides is excellent.

You can see it here, and any cover for a Smoothside would be very similar, since basic hull lines and bow rail configuration are identical.

http://smg.photobucket.com/user/lgolt...3102644227

Expect it to cost about $1200.

I do not trail mine with cover on, since I believe it puts too much stress on the cover and boat. My cover is only used for trailer storage as shown in the photo, although it could be used for a moored/docked boat also.

Mills covers are not affected by either single or twin engine installations. My Ribside now has twins, but when the cover was designed and patterned, it had a single.