Wheel bearing size 172 Cup

[James363]

Hi, I need to replace my front wheel bearing on my 172 cup, and a look on euro car parts is telling me there are two sizes (40ID 84OD or 37ID 72OD). K-tec has different categories for 182 Cups and everything else, but it doesn't say which is larger. Renault parts direct has different bearings for 172 and 172 cups, and doesn't mention the difference. Does anyone know for certain what bearing I should use or is the only way to find out to have it all apart and measure it?
I found this thread on the matter, but with no one replying to confirm that it was correct, and just wanted to be sure before I order one up
http://www.cliosport.net/threads/172-cup-which-wheel-bearing.619856/
Thanks
James