Мост к сожалению 9.5 , что касательно колодок, можно смотреть так (и не только колодки), идём на
http://parts-catalog.acdelco.com/catalog/catalog_search.php , вбиваем свой VIN, дальше заходим в
Brake/Wheel Bearing ->
Rear Friction/Drums & Rotors и видим в графе
ACDELCO GM ORIGINAL EQUIPMENT что у нас были две модификации тормозов, одна штатная (11.15 X 2.75),а другая опциональная (13 x 2.5) и имела RPO код JB7 или JD7, поэтому смотрим по VIN нашу комплектацию, можно например на
http://www.usa-auto.ru/vincode.php , но там нужна регистрация, получаем такое полотно:
1SB: PACKAGE-OPTION 02,(1SB)
1SZ: PACKAGE OPTION-,(1SZ)
43U: EXTERIOR COLOR,PRIMARY,(43U)
52D: TRIM COMBINATION CLOTH, NEUTRAL,(52D)
52I: INTERIOR TRIM LIGHT NEUTRAL,(52I)
55L: SECONDARY COLOR EXTERIOR, LT AUTUMNWOOD MET (94),(55L)
6GL: SPRING COMPTR SELECT FRT LH,SUSP(6GL)
7GL: SPRING COMPTR SELECT FRT RH,SUSP(7GL)
A20: WINDOW,REAR QUARTER VENT SWING OUT,R/Q VENT SWING OUT WDO(A20)
A31: WINDOW,ELECTRIC OPERATED,SIDE,ELEC SI WDO(A31)
AE7: SEAT,FRT SPLIT,EASY ENTRY,EASY ENTRY SPLIT F/SEAT(AE7)
AM7: SEAT,REAR FOLDING,RR FLDG ST(AM7)
AU0: LOCK CONTROL,REMOTE ENTRY(KEYLESS ENTRY SYSTEM),REMOTE ENTRY LK
AU3: LOCK,SIDE DOOR,ELECTRIC,ELEC S/D LK(AU3)
B85: ORNAMENTATION,EXTERIOR,BELT REVEAL MOLDING,BELT RVL MLDG(B85)
C60: AIR CONDITIONER,FRONT,MANUAL CONTROLS,A/C MAN CONT(C60)
C6P: GVW RATING 8, 600 LBS/3, 900 KG,8600 LB/3900 KG GVWR(C6P)
D48: MIRROR O/S LH & RH, REMOTE CONTROL, ELECTRIC, COLOR,ELEC R/CON P
E63: BODY EQUIPMENT,FLEETSIDE PICKUP BOX,FLEETSIDE PUBX(E63)
F60: SPRING,HEAVY DUTY,FRONT,HVY DUTY FRT SPR(F60)
FF6: ARM,TORSION BAR SPRING ADJUST,LH,TORS BAR ADJ ARM(FF6)
FF7: ARM,TORSION BAR SPRING ADJUST,RH,TORS BAR ADJ ARM(FF7)
GMC: PLANT CODE PONTIAC, MI, GM T&B,PONTIAC,MI GM T&B ASSEMBLY PLANT(
GT4: AXLE,REAR,3.73 RATIO,3.73R(GT4)
JD7: BRAKE SYSTEM,HYDRAULIC POWER DISC,DRUM,HYD PWR DISC/DRUM BRK(JD7
K34: CRUISE CONTROL,AUTOMATIC,ELECTRONIC,CRCONT(K34)
K47: AIR CLEANER HIGH CAPACITY,HI CAPACITY A/CL(K47)
K60: GENERATOR,100 AMPERE,100 AMP(K60)
KNP: COOLING SYSTEM,TRANSMISSION,HEAVY DUTY,HVY DUTY TRANS CLG SYS(KN
MT1: TRANSMISSION,AUTO,4-SPD,THM-R2(4L80-E),4-SPD A/TRANS(MT1)
N33: STEERING COLUMN,TILT TYPE,TILT STRG COL(N33)
NP5: STEERING WHEEL,LEATHER WRAPPED,LEATHER WRAPPED STRG WHL(NP5)
P06: RING,WHEEL TRIM,WHL TR RING(P06)
SLL: SOLD ORDERS,SOLD ORDER(SLL)
U01: LAMP,FIVE ROOF MARKER,TRUCK,RF MKR LP(U01)
UL0: RADIO AM/FM STEREO, SEEK/SCAN, AUTO REV MUSIC SEARCH CASS, AUTO
V22: GRILLE,RADIATOR(CHROME),CHROME GRL(V22)
V27: FRONT BUMPER GUARDS,FRT BPR GUARDS(V27)
V73: VEHICLE STATEMENT - US/CANADA,US/CANADA VEHICLE STATEMENT(V73)
VB3: BUMPER,REAR STEP,INCLUDES IMPACT STRIP(CHROME),CHROME STEP BPR(V
VG3: STRIP,FRONT BUMPER IMPACT,FRT BPR IMP STR(VG3)
VK3: LICENSE PLATE,FRONT MOUNTING PACKAGE,FRT LIC PLT MTG PKG(VK3)
VR4: TRAILER HITCH(WEIGHT DISTRIBUTING PLATFORM),EQLZR HITCH(VR4)
X88: CONVERSION CHEVROLET,CHEVROLET(X88)
XGK: TIRE FRONT LT245/75R16/E BL R/PE ST OOR(9591214),TIRE(XGK)
YD3: AXLE FRONT (BASE EQUIP) FOR SCHEDULING GVW PLATE,FRT AXLE(YD3)
YD6: SPRING,REAR(BASE EQUIPMENT),RR SPRING(YD6)
YE9: CONVENIENCE PKG COMFORT & DECOR LEVEL #3,COMFORT & CONVENIENCE P
YGK: TIRE REAR LT245/75R16/E BL R/PE ST OOR(9591214),TIRE(YGK)
Z82: TRAILERING PACKAGE(SPECIAL)(REESE TYPE HITCH),PROVISION FOR HD T
ZGK: TIRE SPARE LT245/75R16/E BL R/PE ST OOR(9591214),SPARE TIRE(ZGK)
ZQ3: DRIVER CONVENIENCE PACKAGE II(MERCHANDISING OPTION),DRVR CONVENI
ZY2: TWO TONE COLOR COMBINATION,TWO-TONE COLOR COMB(ZY2)
По нему видно что у есть опция JD7,а значит у нас стоят 13 x 2.5 и соответственно наш p/n 171-722, ну а дальше от этого p/n можно искать cross номера.