All I know is that it's a 2000 Mitsubishi Magna Executive 3.0L V6.
What do the series letters mean and how do I know which one relates to my vehicle?

Any and all help appreciated

Cheers

It will be in the VIN number, you will see either TH or TJ for a 2000 model.

VIN begins with 6MMTH... its a TH
VIN begins with 6MMTJ... its a TJ

should be either of these if its an 2000 model.

Same rationale can be used to ascertain any TR-TW and KR-KW model

Thanks for the help!