Upper Coolant Housing Filler Neck B16 B18C5 16AN Fitting Type R Civic DC2 Si CRX •Chrysler 145mm(5-3/4") diameter

145mm(5-3/4") diameter

for GMC Sierra 3500 Classic WT 6

Replace weak stock unit to Aluminum Racing Mount3

Now you can and improve its look with a real carbon fiber horn ring from Hiwowsport

Manufactured to meet or exceed OEM Specifications

Upper Coolant Housing Filler Neck B16 B18C5 16AN Fitting Type R Civic DC2 Si CRX •Chrysler 145mm(5-3/4") diameterUpper Coolant Housing Filler Neck B16 B18C5 16AN Fitting Type R Civic DC2 Si CRX The B16 B18C5 (Type R) Upper Coolant Housing offers a versatility you won't get anywhere else. We offer this with standard silicone hoses or AN fittings. This unit allows you to point the overflow fitting in any direction to allow clean and simple setup.