Don't use Dayco, they suck, stick with OEM, we have had this discussion before. I know first hand that Daycos and Ultras do not mix, I have like 7 Daycos in my garage waiting for Ebay.
There are many that will work. I always used the 66 belt and had no issues. The 42,70,1105,ect. are all std. belts with no ribs on the backside, I was told for extra cooling.? The ULTRA is definetly a High Perf. machine, so the 66, or if you have a need for harder rubber compound, the 67 would be needed. If you dont terrorize on your ride a 1105 or the 42 belt may work fine. Also they make good ride home belts(less expensive) if you tear one up.
Top cog are the way to go. Go with the 066 or 067, but with almost 18k miles on two different Ultras, and only broke one belt, maybe I don't know what I am talking about.
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