Spoke Size / Spoke Length Database - What size spokes do I need?

Look else where if i were you, the 236's will come up too short (you won't be able to get the spoke into the nipple) and the 242's will be too long and potentially you will run out of thread on the nipple with the spoke poking thru into the rim.

Sigh

I just had a look on SPA cycles and a general google suggests they will cost alot. The benefit of going with either 236 or 242 is that I can get them trade price which is a massive boon. Could I go for a longer nipple to make up the difference?

Edit: also no jot on cyclebasket