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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 1978 Dodge Diplomat Base.
Vernet
Part # TH5962.92J
$12.63
Vernet
Part # TH5962.82J
$11.58
Vernet
Part # TH1378.96
$9.47
GMB
Part # 120-1070
$46.52
Gates
Part # 33036
$19.83
GMB
Part # 920-2110
$44.77
Cometic Gasket
Part # C15054-060
$20.02
Gates
Part # 21086
$26.36
Motorad
Part # 206-195
$8.20
Motorad
Part # ST16V
$13.00
Gates
Part # 20949
$51.36
Four Seasons
Part # 36713
$46.62
Motorad
Part # 3003
$20.15
Motorad
Part # 5200-160
$16.15
Edelbrock
Part # 8887
$491.55
Gates
Part # 20602
$24.47
Gates
Part # 43025
$46.92
ContiTech
Part # 52818
$40.39
Gates
Part # 25528
$21.82
GPD
Part # 8241264
$13.15
This page groups parts listed for the 1978 Dodge Diplomat Base. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of cooling system parts for the 1978 Dodge Diplomat Base. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Motorad, Gates, Dayco, Vernet, and Four Seasons, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
