Heater hoses and expansion tank hoses are mostly 5/8" from 1985 on so check the bore size as some were actually 1/2" hose with flared ends of 5/8" you will need to use a restrictor pipe
MOC210.
Original 5/8" rover hoses were 1"(25mm)outside diameter but have since been reduced to about 7/8" the same as this
GRH905.