This 307 came from an 87 Cutlass with 46K on it. A couple might be the factory belts. The air pump belt is an oddball one, narrower than the others.
The air pump one is a little skinny runt. The PS belt on your 87 pictures is aftermarket. 44.0". The PS belt actually was a 7/16 x 44.5" nominal belt, p/n 9433741.
WP to alternator should be p/n 22524186, and it was a 3/8 x 43.0" (the 430 aftermarket belt on there is the same size replacement).
The other 2 belts are factory belts. The A/C which was discussed being 7/16 x 52.5", GM p/n 9433757, and the A.I.R. pump 9433847, 5/16 x 46.5". This is for
Zebbman so he'll know what length of belts came on his car originally.
And for you late 84
H/O (LV2-9), and 85-87 442 (LG8) guys out there...
The alternator belt p/n changed in the late 80s from 469595 (3/8" x 55.75")to 9433764 (3/8 x 56.0"). Sometime in the 90s, the PS belt changed from 9433640 (3/8 x 45.0") to 9433743 (7/16 x 45.5"). The A/C belt was 9433756, 7/16 x 52.0" and the A.I.R. pump belt remained the same, 9433847 (5/16 x 46.5"). Confused yet?