They only fit the older McCauley brakes.
In an effort to help Vinnie:
Grant, when you say 'older' is that older as in the 3 piece McCauley with the center hub using six (6) bolts to secure the wheel assembly?
I wouldn't have thought Cessna still used that problematic design in 1980 when your plane was built as I thought McCauley upgraded to the two (2) piece design by then (using 3 bolts vs 6 bolts to secure the wheel halves) and eliminated that center hub?
Vinnie, can you tell us if your wheels use the 3 bolts system or the 6 bolts?