rear brake drum size 2004 Mk6

[cowasaki]

My brake shoes are needing to be replaced and there is a 35% discount going on at Europarts till midnight Sunday (saving me £44 on everything). I went to order the shoes, drums and front pads but it says that there could be two different sizes. Is there an easy way to check without removing the brake drum? Only asking as I am off to work now and when I get back I need to place the order. It would be much easier to just remove and then replace a wheel especially if it's raining later. I put my reg number into Europart's and another web page and both state it could be 254mm diameter with 52mm width OR 280mm diameter and 65 width. I suspect both drum and shoes need replacing as they've been making a little noise for a week or so but I have yet to see. I was going to order drums, shoes and pads and take the drums back if they are not needed.

Thanks