[Healeys] SU HD8 Needles

[Roger Grace]

I am in the process of overhauling the carbs for my p2  BJ8
The needles are marked 423 and assume that they must have been changed during past 48 years or so.
My old SU book gives me no clues about them for a 0.125 shank.
So, just wondering if anyone can throw any light on them – perhaps they are non standard SU ?
I do intend to replace them with SU, UH needles to start off.
Appreciate any input
rg
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