Trouble Installing 18 spline A-833 through dual disc clutch assy.

Yes it is HEMI four speed 18 spline. I think Brian slid the discs right on the splines. Talk to me about throwout bearings. HEMI units used different ones my 69 parts book shows. Anyone know the difference?
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I thought the only difference in TO bearings was the housing. You have a small one for the 23 spline and a bigger one for the 18 spline. AFAIK, the bearings are the same, it’s just the housing or whatever it’s called is different.