Series 3 brake query

Hi, I have a 1981 series 3 hybrid mongrel thing, basically running discovery drive chain and axles, the acres are from a 200tdi discovery because they have the dual port front calipers, so I'm converting these to
single, does anyone know which bleed nipples go to which cylinders? I'd like to route the one input port into where a bleed nipple normally is if that makes sense?! I'm just not sure which bleed nipples go where? Does anyone also know if any other discovery single port front calipers would bolt straight on? Thanks very much

twin pot brakes for safety........

Yeah but it's only on a series 3 hybrid farm vehicle off roady type thing, and they moved away from twin port anyway so it wasn't exactly the most revolutionary safety feature

Think we may need some info/pics on this one.