Thanks for looking it up.
Now that I think about it some more, I think I need the length of a YJ with PS and A/C.
I found this, it looks right.
Years    Veh    Description     Part Number
83/86    SJ    4.2L (258) Serpentine Belt, 81.7" long, 6 ribs w/o PS, w/ 56/66 amp    4060817
83/86    SJ    4.2L (258) Serpentine Belt, 88.2" long, 6 ribs w/ PS, w/ 78 amp    4060882
87/90    XJ    2.5L Serpentine Belt, 73.5 long, 6 ribs w/o AC    53002900
84/90    XJ    2.5L Serpentine Belt, 81.7 long, 6 ribs w/ AC    53001120
91/95    XJ    2.5L Serpentine Belt, 96.7 long, 6 ribs w/ AC, w/ PS LHD    53007539
91/93    XJ    2.5L Serpentine Belt, 71.5 long, 6 ribs w/o AC w/ PS    53007595
91/93    XJ    2.5L Serpentine Belt, 69.0" long, 6 ribs w/o AC w/o PS    53010010
94/95    XJ    2.5L Serpentine Belt, 71.0" long, 6 ribs w/o AC, w/ PS    53031118
96/00    XJ    2.5L Serpentine Belt, 91.0" long, 6 ribs w/ AC, w/ PS LHD    53011035
96/00    XJ    2.5L Serpentine Belt, 79.0" long, 6 ribs w/o AC    53010257
97/00    XJ    2.5L Serpentine Belt, 2415mm long, 6 ribs w/ AC RHD    53012002
96/00    XJ    2.5L Serpentine Belt, 1980mm long, 6 ribs w/o AC RHD    53010311
95/97    XJ    2.5 Diesel Serpentine Belt, 2185mm long, 8 ribs w/o AC    4796033
98/01    XJ    2.5 Diesel Serpentine Belt, 2195mm long, 8 ribs    4883445AA
87/90    XJ    4.0L Serpentine Belt, 102.5 long, 6 ribs    53002899
91/93    XJ    4.0L Serpentine Belt, 97.5 long, 6 ribs LHD    53006870
91/95    XJ    4.0L Serpentine Belt, 2500mm long, 6 ribs RHD    53010279
94/95    XJ    4.0L Serpentine Belt, 97.5 long, 6 ribs LHD    53010269
96/01    XJ    4.0L Serpentine Belt, 97 long, 6 ribs LHD    53010314
96/01    XJ    4.0L Serpentine Belt, 2270mm long, 6 ribs RHD    53010234
93/95    ZJ, ZG    2.5L Diesel Serpentine Belt, 2285mm long, 8 ribs    4797801
96            ZJ, ZG    2.5L Diesel Serpentine Belt, 2275mm long, 8 ribs    4864599
97/98    ZJ, ZG    2.5L Diesel Serpentine Belt, 2195mm long, 8 ribs    4883445AA
93/95    ZJ    4.0L Serpentine Belt, 71.0" long, 6 ribs w/o AC    53031118
93/95    ZJ    4.0L Serpentine Belt, 97.0" long, 6 ribs w/ AC    4612277
96/98    ZJ    4.0L Serpentine Belt, 92.2" long, 6 ribs    53010150
96/98    ZG    4.0L Serpentine Belt, 89.5" long, 6 ribs RHD, w/ 117,136 amp    53054339
93/95    ZJ    5.2L Serpentine Belt, 90.0" long, 7 ribs    53008744
96/98    ZJ    5.2L, 5.9L Serpentine Belt, 89.2" long, 7 ribs    53011097
99-01    WJ    3.1L Diesel Serpentine Belt, 2490mm long, ribs    5015962AA
99-04    WJ    4.0L Serpentine Belt, 88.2" long, 6 ribs    4854033AB
99-04    WJ    4.7L Serpentine Belt, 87.5" long, 6 ribs    53032037AJ
02/04    KJ    2.4L Serpentine Belt, 87.5" long, 6 ribs w/ or w/out AC    53032037AJ