Pilot screw o ring?

I was going to remove my carbs one last time for a cleaning as its getting warm out, I was reading a lot about the being o rings under the idle mixture screws on post 1980 models, I want to replace them, I removed the screws and there was just a spring, no o rings or anything else? Here is a pic

Fuel Idle Mixture Screw with Washer and O-Ring.

Products - V4 Dreams

O-Ring & Washer for Keihin FCR Carb Pilot Screw Air Fuel Mixture Enrichment

Genuine Mikuni N133.037. Fits: TM32-38mm Carburetors. Pilot air and pilot fuel screw o-ring. for superior selection & service! The Fatman makes deals!

Genuine Mikuni N133.037 Pilot Air Screw O-Rings (4-Pack) TM32-38mm Carburetors

O-Ring For Mixture Screw

KEIHIN : 34.P/S O-ring (Repair part) [16075-KG8-9010-M1]

Check out the deal on O-ring For Idle Jet / Mixture Screw at Parts for Classic BMW Motorcycles

O-ring For Idle Jet / Mixture Screw

Zodiac Discontinued Out of stock Pilot Screw With O-ring, Small

4x O Rings & Washers for Mikuni / Keihin Carb Pilot Fuel Air

Products - V4 Dreams

S&S Idle Mixture Screw Super B/D/E/G, TwoThroat, early Style, w/o

Pilot Air Screw o-ring replacement - KZRider Forum - KZRider, KZ, Z1 & Z Motorcycle Enthusiast's Forum

MIXTURE SCREW O RING - Allstate Carburetor

O RING,PILOT SCREW for KZ400 1974 USA CANADA / MPH KPH - order at

Idle Mixture Screws Triumph Bonneville, Thruxton, Scrambler, America & Speedmaster

Fuel Screw, Pilot Jet, and Main Jet - JD Jetting

Pilot screw location ZX7R -P8

K&S Carburetor Air/Fuel Mixture Screw Kit - 56-2008

YAMAHA YBR 125 YBR125ESD 3D98 2008 CARBURETOR PILOT SCREW SET >