Re: O day fixed keel
I own a 1974 O22, and 20" on my keel sounds about right. O'Day made the 22 with a fixed keel up until (I think) about 1978 or so, but my experience tells me that all the fixed keels were the same, and mine looks like the one in the pic above.
If you need to, I can measure my trailer and give you an idea of what works for me... let me know.