Re:Would some post the exact size of the tiles?
Given even that:
Does he not already HAVE a copy of the game? If so - measure the tiles you HAVE!
Also, its usually way better to just BUY A COMPLETE GAME or EXPANSION (again, given the low costs) and then use the home-made, printed on lable paper, custom fronts and stick them onto the pile of tiles you get in the 2nd game.
Plus, then you have a new set of wooden parts you can modify for such things as keeping track of the size of longest road or largest city (for the King/Robberbaron expansion), and other fun things.