those are nice vintage hubs, and the price is good, BUT as you see it has the UG style cassette body WITH the stepped-down threaded end for that smaller 11T sprocket. Unless you have a cassette in-hand or know where you can get one, I think you'll actually find it's easier these days to find brand new FREEWHEELS in 5,6, 7 and even 8-speeds (Idon't recommend an 8-S freewheel, however) than one of these (now rare) cassettes.
It's not too hard to find decent 6-S hubs, either 36 or 32 hole, that take a freewheel. Some folks here in C&V might even have some for sale or trade.

Interesting that the pair that Jeff links to above is a Dura-Ace hub, 126 spacing (which is 6-7 speed) and it's clearly for a freewheel...so Sheldon's comment about ALL 6 and 7 speed DA hubs using a UG cassette obviously means just the hubs that take a cassette...some take a FW (and go for $128 a pair!).

You won't have to spend $128 to get hubs that will work well for you