You are correct, 1595 cc had an aluminium oil filler tube & no breather in top of rocker cover. If you use the 1st number in engine number will tell you the year same with Chassis, gearbox, & differential numbers. The 1595cc Exhaust manifold exit is in the centre & the 2L is off centre as well if you have a photo of the other side of the motor. In this photo it looks like the oil filter below the carby which makes it a 2L were the 1595 cc the filter is on the passenger's side if it hasn't been taken off.
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