The book states an A23 size belt should be fitted but this involves removing the front fan nut. This isn't an easy task if you do not have the proper tool to lock the flywheel.
An A24 size belt can be fed over the fan blades (carefully) without needing front nut disturbance. The alternator needs both bolts removed so as the pulley can be tilted forwards, then ease the belt into the pulley & refit the alternator.
The adjustment isn't as great but there's still plenty there.
Don't forget to retension after 500 or so k's.