I originally had air shocks and scraped a header riding two up at highway speed!

Got rid of those as quick as I could. Found some old used 440s that barely got me through a season, then bought some new 13" HD 444s. I love them with the Taxi Tire. BTW, I have some brand new Progressive 440 black chrome retrofit covers I'd sell cheap if you're interested.
Did you have to offset them with a spacer?
I spoke to progressive and they said they don't make them for the valk but all you have to do is add a few washers or a spacer.