Odds for turning a pair into a set

[Barry5]

I know the odds for 2 outs are 11/1 for making a set from a pocket pair from flop to river and 22/1 from turn to river but can anyone please advise what the odds are for 2 outs pre flop. I get to 4/1 but Dan Harrington seems to indicate in his book that it is 7/1.

Thanks.