I just looked at my four cylinder 109 - It's cylinders have only two holes, top one has the hose in the angled one towards the back, both cylinders have the interconnecting pipe on the straight hole, probably the centre one on yours. I suspect the three hole cylinders are a later mod to allow left and right interchangeability.
All fittings have a conical seal, and no sealant is needed or permissible (Bits of sealant accidentally getting into the hydraulic circuit could block small holes).
A possible issue you may come across is that I'm pretty certain the threads on the fittings changed during production, and there could be problems with new parts. Probably changed from BSF to UNF to metric. Since the brakes have been upgraded, you probably have no idea what they came off originally!
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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