Just like cars - go for a test drive! Head over to a jeweler or wherever you can find some tags and try them on. This is how I determined the F1 was right for my first tag.
E82 '13 135is
- Space Gray/Coral Red, 6 MT,
Heated Seats, 50% tint, clear bra, BMW Perf. Grilles, BMW Perf. CF Diffuser - #180/586