after trying to find out some options on replacement parts for our van, fezzik, finally dug out the RPO sheet and resolved the options out. well, at least all the ones i could find options for.

AD8 - right side door option?
au3 - electric door locks
a01 - tinted windows
a18 - swing out window, driver
a19 - swing out window, passanger
a31 - power side windows?
a57 - passanger seat

cd4 - pulse wipers
c5s - 6600 GVW
c60 - manual HVAC system

d2d - gear driven speedo?
d20 - sun shade, pass?
d45 - mirror, stainless

e24 - wwr side, cargo, hinged?
e5z - speedo adapter delete
e6d - more speedo options?
e9z - speedo key delete

f59 - stock stabilizer bar

gq1 - axel, std ratio
gu4 - 3.08 ratio rear
g50 - heavy duty spring, rear

jb5 - brakes, power dic, 6400lb

k19 - air injection reactor (cat) system
k34 - electronic cruise control
k60 - 100 amp alt

lod - ???
lo3 - 305 engine

mx1 - trans provisions
m40 - 3L80?
missing m50 for trans cooler?  aftermarket?

na5 - tier 0 emissions
nl7 - 33 gallon fuel tank
n31 - custom steering wheel (oh yeah)
n33 - tilt steering
n40 - power steering
n67 - wheels?

slm - sales processing

tt5 - ???

ua1 - heavy duty battery
um6 - stereo head unit
up8 - stereo options
u37 - front and rear bumpers
u66 - 4 speakers

v22 - chrome grill radiator
v37 - chrome bumper
v73 - fixed antenna

xeu - wheels?

yd5 - stock front springs
ye7 - special performance package
yl8 - ???

zeu - ???
zq2 - driver convience package
zw9 - base body / chassis
zy1 - solid color paint
z53 - instrument cluster, oil press, coolant temo, voltage

12u - primary color, silver metallic
8e2 - front seat delete (conversion)
82i - interior trim, medium dark grey
82w - interior trim, vinyl, medium dark grey