This Delta replacement ball does work on some old style Delta single handle tub and shower valves and bathroom lavatory sink faucets, but is mainly used on the Delta single handle kitchen faucets.
$20.61

This Delta repair kit has everything you need to repair the older style Delta single handle tub shower and bathroom lavatory sink faucet. with either one of the 2 balls shown before. this kit includes seats and springs and plastic guides for both type Delta balls, Delta balls sold separately.
$24.03