Most of the lifts (especially the older Hewitt lifts) come with a cradel that the keel rests on on each of the cross members. Works great for stern drives and looks like this:
For an inboard, it needs to look like this:
Hewitt calls them "V-bunks". You are probably all set with your current set up as long as it looks like the second picture.
(Message edited by csquared on May 17, 2005)