Don't know if this will help but here's some info:

see post #21
http://www.vehicross.info/forums/sho...6&postcount=21

see post #36
http://www.vehicross.info/forums/sho...0&postcount=36

start at post #42
http://vehicross.info/forums/showthr...=lock+cylinder

After Dub's experience, I bought this lock cylinder on ebay...."says" it fits ours, but I don't know for sure as never installed it. The 2 keys it comes with are NOT marked as ISUZU or have the logo, but they do "look" like our OEM Isuzu keys.
http://www.ebay.com/itm/Ignition-Loc...#ht_1279wt_875

My box says:
IGNITION CYLINDER W/KEY
P/NO US-244L
AZUZW5
1 PCS
MADE IN TAIWAN