HO Scale Harriman Roof Vent Kit View fullsize Image by Keystone Details This HO Scale Harriman passenger car roof vent kit contains 16 cone style vents, 16 messenger style vents, 8 duct style vents, 8 smokestacks and 8 sanitary vents. All come with a mounting pin, just drill a vertical hole where you want to place them. purchase on shapeways n scaleJohn LeMeriseJune 4, 2018passenger car details 0 Likes