Heuer 3646 pushers

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Today at 9:42am
Can anyone help please?
Would a 3646 third execution originally have had smooth pushers ? If so is there a part number or specification that might just help locate some to replace a pair of later ‘ribbed’ pushers that are still in demand
 
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none of the 3646 series came with fluted pushers, only the later 7763c with compressor case