2 plastic 5/8" outlets at the same end and close together which exit the heater on the r/h side. The later HIF38 1275 and single point cars had a change point where the plastic outlets exited on the l/h. This is a JEF10005.
These units take 5/8" heater hose, therefore on cars pre 1989 where the pipe work is still 1/2" you will need to fit 5/8" hose pipe with a reducer
MOC210 and then 1/2" hose as required. The plastic outlets are on the new matrix but available as
JEP10007MS repair kit if required. Use 22G1417 seal. The outlet pipe are 47.35mm centre to centre.
In 2023 the supplier changed the radiator in order to remove the outputs maintained by a plate (which was the main leak).
As a result, the two outlets are slightly closer together, so you will need to slightly ovalize the holes in your heater unit.