In addition to having an old copy of the WWEPC on a PC, which lets me match part numbers in a database, there's also Rhonda at the local Suzuki dealership - let me tell you, that girl KNOWS her stuff - she can tell you what parts can be interchanged, even when the numbers are different, and what part numbers supercedes what, especially on the GVs.
I've seen occasions on which I walk in & say I'm looking for XYZ, and she will sit and look at me for 15~20 seconds and then get up from the desk and fetch the part, she'll check the computer for the price, but she knows what she's looking for and which bin it's in "off the top of her head".