Old 10-28-2020, 08:28 AM
  #2  
D3MON
 
Join Date: Jan 2019
Location: Western MT
Posts: 162
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are you referring to the aluminum/brass washer/shim type deal that goes between the cooling head and the block?
if so you are looking for part number 743033-03, i was able to find it on the kyosho website still available for sale, might be worth a shot.
you really don't "need" it, as long as the head, or head button (where the glow plug fits in) will seal to the block. it will increase your compression, also giving slightly more power, as long as it seals and doesnt give too much compression as more "RTR" type engines tolerances arent as tight, it should be fine without. if you hear pinging or pre-detonation it is too much.
hope that helps.