Recently replaced all hoses on my 87 XR4 here is an all inclusive list of the hoses used.
* MEANS OBSOLETE USE SUITABLE REPLACEMENT
P/N DESC
E5RY-8260-A UPPER RAD HOSE
1/2 I.D. X 19"LG SURGE TANK TO UPPER RADIATOR
E6RY-8286-B LOWER RAD HOSE
E8RY-8B081-A SURGE TANK TO LOWER CROSSOVER TUBE
E5RD-8B081-BA* LOWER CROSSOVER TUBE TO LOWER RADIATOR
E5RY-18472-B HOSE HEATER, VALVE TO INTERMEDIATE PIPE
E5RY-18472-C HOSE, HEATER,VALVE TO INTERMEDIATE PIPE
5/8 I.D. X 2"LG. INTERMEDIATE PIPE TO HEATER CORE
5/8 I.D. X 2"LG INTERMEDIATE PIPE TO HEATER CORE
E6ZZ-18472-E HEATER SUPPLY,THERMOSTAT TO WATER MANIFOLD
E5RY-28472-A HEATER SUPPLY,WATER MANIFOLD TO HEATER VALVE
3/8 I.D. X 13.5"LG WATER MANIFOLD TO SURGE TANK
E5RY-18472-D HEATER VALVE TO OIL COOLER MANIFOLD
E5ZZ-18472-A OIL COOLER MANIFOLD TO OIL COOLER
E5RY-18472-F OIL COOLER TO OIL COOLER RETURN TUBE
E5RD-8A567-BA* OIL COOLER RETURN TUBE TO WATER PUMP
E5ZZ-18472-D INTAKE MANIFOLD TO OIL COOLER MANIFOLD
I used silicon hose from BAT for these three
5/8 O.D. X 2" WATER MANIFOLD TO TURBO
E5SZ-8A506-A TURBO TO INTERMEDIATE PIPE
E5SZ-8A506-A INTERMEDIATE PIPE TO BLOCK
