>  "sha shim 1mm"
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dellorto SHA 1mm carburetor shim - 20mm OD
dellorto SHA 1mm carburetor shim - 20mm OD
  $3.99
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for older style sha dellorto carburetors

OD - 20mm ID - 18mm

also tomos oem a3 shim with part number 219586
more info
dellorto SHA 1mm carburetor shim puch
dellorto SHA 1mm carburetor shim for puch mopeds +
  $5.50
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OD - 21mm ID - 19mm more info
dellorto 1mm SHA shim type II
dellorto 1mm SHA shim - type II
  $3.99
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you need one of these to have a full seal

OD - 21mm
ID - 19mm
more info