Gernade shell questions

My O-ring (the one that holds the bb's in) broke and I lost both of the bearings for my Matrix M203 40mm Grenade Shell (120rd) which kit would work or will both not work?

http://www.airsoftpost.com/product_info.php?cPath=21_514&products_id=28558

http://www.airsoftpost.com/product_info.php?cPath=21_514&products_id=26353

And does anybody know the sizes of bearings I need?

If you could get a link of the grenade shell that needs the replacements it may help.

This one http://www.airsoftpost.com/product_info.php?products_id=33660

ok...instead of paying 12 to 15 bucks,plus shipping, for the sets......take the broken o-ring and any bearings you have left to your local ace hardware....o-rings are around 25cents each or less and the bearings are around 10-15 cents each..i used to get bearings for my madbull shells all the time at ace....the materials in the kits listed above cost less than 2$ to 3$....

Alright, I'll do that. Thanks