To help you choose what Wii Mod Chip is right for you I found this guide on the net.. thought I might just put it here save you guys the trouble.

Quote:North American Consoles (USA, Canada, and Mexico) have 3 prefixes LU1, LU3 and LU5. LU1 production seems to have stopped LU3s are still produced in small quantities and LU5s seem to provide most North American production.
LU1
LU10000xxxx - LU10580xxxx D2A/DMS/D2B without cut pins
LU10580xxxx - LU10613xxxx (gamble) Could have D2B or could have D2C
LU10613xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips (You will need to open to find out which is installed)

LU3
LU30000xxxx - LU31539xxxx D2A/DMS/D2B without cut pins
LU31539xxxx - LU31546xxxx (gamble) Could be safe could have cut pins
LU31546xxxx - LU31867xxxx Have D2B Chips with Cut pins
LU31867xxxx - LU31874xxxx (gamble) Could have D2B with cut pins or could have D2C
LU31874xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips (You will need to open to find out which is installed)


LU5
LU50000xxxx - LU51522xxxx D2A/DMS/D2B without cut pins
LU51522xxxx - LU51634xxxx (gamble) Could be safe could have cut pins
LU51634xxxx - LU52386xxxx Have D2B Chips with Cut pins
LU52386xxxx - LU52390xxxx (gamble) Could have D2B with cut pins or could have D2C
LU52390xxxx - [And Higher] Have either D2C, D2C2, or D2E Chips (You will need to open to find out which is installed)

European Consoles - have one Prefix LEH1 though the serial number length ranges from 11 digits to 12 digits.
LEH1000xxxxx - LEH1231xxxxx D2A/DMS/D2B without cut pins
LEH1231xxxxx - LEH1233xxxxx (gamble) Could be safe could have cut pins
LEH1233xxxxx - LEH1347xxxxx Have D2B Chips with Cut pins
LEH1347xxxxx - LEH1356xxxxx (gamble) Could have D2B with cut pins or could have D2C
LEH1356xxxxx - [And Higher] Have either D2C, D2C2, or D2E Chips (You will need to open to find out which is installed)

South Pacific  Consoles - (Australia and New Zealand) have one Prefix LAH1 though the serial number length ranges from 11 digits to 12 digits.
LAH1000xxxxx - LAH1014xxxxx D2A/DMS/D2B without cut pins
LAH1014xxxxx - LAH1016xxxxx (gamble) Could be safe could have cut pins
LAH1016xxxxx - [And Higher] Have D2B Chips with Cut pins

Japanese Consoles - LJF1 and LJH1
--Not enough info to provide a valuable estimate--