There is an XLA getting around here in Cairns, Australia. Owned by a member of the local Cairns Motorcycle Restorers Club. I have seen the engine number so know it is an XLA, but forget what year it was. Never seen an XLB though.
And not sure where this pic comes from. Some have suggested Malta from the old Nortons in the background. But I know such Nortons were used throughout southeast Asia by police and army too, as in the 70s they were still banging around the streets in the hands of civilians, when I was there.
And I think this is an XLB belongs to a guy in Europe. (Found it on gooogle images ages ago when discussing on the XLforum.net.
Although, I notice the bikes in my pics have the earlier type gas tanks, not the turtle tank picutred in the XLB pic, so I would guess all these are XLAs?