Replacing Truvativ BB Bearings with Enduro ones

Well can you?

I have killed the bearings in my truvativ gxp bb cups. There is now large visible ammounts of play on the bearings. Is this unusual? They have only been on the bike 8 months! I am assuming SRAM dont warranty the bearings as they count as wear and tear.

Anyway last time i replaced the bearings on a race face bb, i had the lbs order enduro ones and just had them press fitted into the cups, however i was living in canada then and now im back in blighty i cant see anywhere that sells them.

I know I can get replacemnt truvativ ones from wiggle but i dont really want to be changing them every 6 months.

betd do them