that diagram is cut off .. and the other GM accessory diagram (2-17) is also incorrect... they don't show the long bolt bolt at the 6 oclock position but it should be there
there are four mounting bolt locations on the ac compressor ,
but only three have to be removed
(1) 9 oclock ...the long stud on accessory bracket that runs through compressor with the 15mm nut on rad side,
(2) the 6 oclock.... bolt... long through bolt from back ..goes through accessory bracket>though compressor > 15mm nut on rad side
(3) 3 oclock ...the bolt that goes through the L support rod bracket >through accessory bracket> compressor > threads into to the bottom of flat bracket
the fourth is the bolt at top that holds the flat bracket to compressor which can stay on for removal
the tensioner pulley will hang into the way when trying to slide off the long stud on the accessory bracket
easier to just remove the tensioner