Part Type: HVAC Heater Core. 1990 International 3700 Depth: 2 In.; Height: 9-1/2 In.; Width: 7-3/8 In.;. 1991 International 3700 Depth: 2 In.; Height: 9-1/2 In.; Width: 7-3/8 In.;. 1993 International 3700 Depth: 2 In.; Height: 9-1/2 In.; Width: 7-3/8 In.;.