Memory says that the conversion sleeves came in the kit when i got mine. But even if they don't they are pretty cheap to buy separate. As for the base in a plugged ball i have them in about 10 balls i plugged to change span and pitch on and have had no problems
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Arsenal: Mega Friction, Break Point,Break,Break Point Pearl,Sidewaysx2,Clutch,Clutch Pearl,Maniacx2,Lunaticx2,Tropical Heat ( Hybryd)Heist Pearl,Link,Hype urethane,Desperado,Grenade Pearl,T-Zone
http://s485.photobucket.com/albums/rr220/stormed1/My%20Arsenal/Bowlingboards.com