On my former 4/4 4-seater (1991) I had Continental 165/80 15 and they performed well and lasted for70000kms.
On my new 4/4 Sport the same tyres are mounted.
The factory recommends 1.3 bar for the 1991 4/4 and 1.5 bar for the 4/4 Sport; this is quite low but provides a softer ride (tyre inflation of better said lack of tyre inflation is part of the Morgan suspension!)
I keep the tyre pressure at 1.8 bar which is better for roadholding and tyre life, but gives a harder ride.
D'herde Bart