They list one of the spiders as 26mm so I guess that is the one The spider complete is only £30 odd from electrue p/n:C00074213.
the bearings on their own are: C00013563 (6205 ZZ type) C00044765 (6206 ZZ) and the seal C00082696. Its pretty damn confusing so dont blame me if these are wrong! i would remove spider and knock out the bearings before ordering and check they are the bearing numbers as above. If masterpart or whoever list 2 kits, buy em both just to be safe.
reminds me of the days of indesit spiders when we had to measure the distance between the centre of the mounting bolts and the centre pulley hole. Why can they not give a different model number to machines with such a major engineering differrence.
is it worth it?