Can any one tell me the size of the ball bearings in the top mount of the macpherson strut on a 2006 VRS.

I noticed some were missing when i put my lowering springs on a little while ago. Im gonna be putting coilovers on this weekend and was gonna replace the missing bearings but i didnt measure them last time i had them out.

i know i could measure them when they are apart but i would like to buy them before hand and do it all in one go.

the complete bearing is only just over a £10 is it worth getting new ball bearings for it?