RA60/65 perhaps? i've got one hiding under the house that wilbo donated to the cause.. it has extra piping there like that one - and it's the proportioning valve (which is usually mounted on the firewall in most cards)
Tho i'm sure the booster on the one downstairs is thinner and the reservoir sits on the rearward inlet ony and has a pipe to feed fluid to the front intlet.
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