From Maximum-Suzuki.com (stuff I'm using is in bold):
Bandit Quick Reference
Oil Filters
* STP SMO-18
* Wix 51359
* NAPA Gold 1359
* OEM Suzuki 16510-03G00-X07
* Amsoil SMF109 (no longer available)
Amsoil EaOM109 (new replacement, much more expensive)
* K&N KN-138
* PerfForm J-509
* Purolator ML16818
* HiFlo Filtro HF138
* Fram PH6018 (piece of %%%% DO NOT use)
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Spark Plugs
Bandit 1200:
NGK JR9C
NGK DR9EIX (Iridium)
Champion Powersports 8809
Champion 809
Autolite 4162
Denso X27ETR
Bandit 600:
Autolite 4302
Champion 653 (G57C)
NGK 3521 (CR9EIX) Iridium
NGK 4548 (CR9EK) Std
Denso U27ETR
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Air Filters
Bandit 1200:
K&N Pod Filters for 1200 (all years) - RU2922
K&N OEM-Style Replacement (2001+) - SU6000
K&N OEM-Style Replacement (1996-2000) - SU7593
Bandit 600:
K&N Pod Filters for 600 (all years) - ??????
K&N OEM-Style Replacement (2000+) - SU6000
K&N OEM-Style Replacement (1996-1999) - SU7593
Suzuki OEM Air Filter - 13780-31F00
K&N Crankcase Breather (Rubber) - 62-1010
K&N Crankcase Breather (Chrome) - 62-1100
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Common Engine Oil
Mobil-1 5w30 (Group-4 true synthetic)
Mobil-1 10w30 (Group-4 true synthetic)
Mobil-1 15w50 (Group-4 true synthetic)
Amsoil 10w40 (Group-4 true synthetic)
Amsoil 20w50 (Group-4 true synthetic)
Shell Rotella 5w40 Synth (Group-3 faux-synthetic, dino)
SuperTech 5w30 Synth (Group-3 faux-synthetic, dino)
SuperTech 10w30 Synth (Group-3 faux-synthetic, dino)
Shell Rotella 15w40 (Group-2 dino)
Castrol GTX 10w40 (Group-2 dino)
Castrol GTX 20w50 (Group-2 dino)
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Tires & Rims
Bandit 1200:
Front Tire Size - 120/70 ZR17, 36psi cold
Rear Tire Size - 180/55 ZR17, 36psi cold
Front Rim Size - 17" x 3.50"
Rear Rim Size - 17" x 5.50"
Bandit 600:
Front Tire Size - 120/60 ZR17, 33psi cold
Rear Tire Size - 160/60 ZR17, 36psi cold
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Batteries
B12 - YTX12-BS
B6 - YTX9-BS
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Lights
B12S/B6S (1st Generation) Headlight - H4
B12S/B6S (2nd Generation) Headlight - Low Beam 9006, High Beam 9005
B12/B6 Naked (All) - H4
B12/B6 (All) Tail/Brake Light - 1157
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Tools
Suzuki Valve Adjustment Tool - 09917-14920
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Miscellaneous
Radio Shack Washer/Shim package (B6 and B12 carburetor needle shims) - 64-3022A