My submission would be 42.
But Paul, really, your question implies a misunderstanding of probability. The correct answer is, indeed, 4/37 as has been stated already. But what I would surmise from your question is that you think that by choosing a predetermined 4 numbers, in this case the last 4, that this will somehow be different to simply choosing ANY 4 numbers. It is not. Choose your numbers any way you like, the probability of one of those coming up on the next spin will always be 4/37.