C-31-54 Cyl. base nut kit, hex. chrome
Fits: 52-85 K; XL Sportster& all 29-73 45…
incl. VAT
Chapter members save 15% · Sign in for member pricing
Estimated delivery: 3–15 working days
Authorised
Iron City Dealer
14-Day Returns
Easy & hassle-free
Secure Checkout
256-bit encryption
Free UK Delivery
On orders over £100
Specifications
- Brand
- Gardner-Westcott
- Part Number
- C-31-54
- OEM Reference
- 16603-72
- Pack Quantity
- Each
- Category
- Cylinder Base Nut Kits
- VAT Rate
- 20%
About This Product
When you're rebuilding a classic Ironhead or an old 45-inch flathead, the finishing touches make all the difference. This Gardner-Westcott cylinder base nut kit features a high-quality chrome finish on traditional hex-style nuts to give your motor that clean, show-ready look. These are designed as an OEM-style replacement for the original hardware, specifically fitting 1952 through 1985 K-models and XL Sportsters, as well as all 1929 to 1973 45-inch Sidevalve models. Replacing tired, rounded-off fasteners with these ensures proper torque and a sharp appearance. This kit is a direct replacement for OEM part 16603-72, providing the reliability you expect from Gardner-Westcott hardware.
Manufacturer part number: C-31-54.
Fitment
29 models52-85 K; XL Sportster& all 29-73 45" SV
Cafe Racer 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1977–1978 | Sportster 1000 XLCR-1000 |
Flathead 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1950–1952 | 45" WL |
Model K 2 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1952 | Model K K-750 |
| Harley-Davidson | 1956 | Model K KH-900 |
Roadster 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1979–1980 | Sportster 1000 XLS-1000 |
Servi-Car 6 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1955 | Model K KHK-900 |
| Harley-Davidson | 1935–1963 | Servi-Car G-750 |
| Harley-Davidson | 1941–1959 | Servi-Car GA-750 |
| Harley-Davidson | 1938 | Servi-Car GD-750 |
| Harley-Davidson | 1935 | Servi-Car GDT-750 |
| Harley-Davidson | 1964–1972 | Servi-Car GE-750 |
Sidevalve 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1935–1948 | 45" WL |
Sportster 13 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1975–1980 | Sportster 1000 XLCH-1000 |
| Harley-Davidson | 1981–1985 | Sportster 1000 XLH |
| Harley-Davidson | 1979–1980 | Sportster 1000 XLH-1000 |
| Harley-Davidson | 1981–1985 | Sportster Roadster 1000 XLS |
| Harley-Davidson | 1983–1985 | Sportster Roadster 1000 XLX |
| Harley-Davidson | 1975–1978 | Sportster Standard XLH-1000 |
| Harley-Davidson | 1957–1959 | Sportster XL-900 |
| Harley-Davidson | 1958 | Sportster XLC-900 |
| Harley-Davidson | 1972–1979 | Sportster XLCH-1000 |
| Harley-Davidson | 1958–1972 | Sportster XLCH-900 |
| Harley-Davidson | 1972–1975 | Sportster XLH-1000 |
| Harley-Davidson | 1958–1972 | Sportster XLH-900 |
| Harley-Davidson | 1983–1984 | Sportster XR-1000 |
Touring 2 models
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1953 | Model K K-750 |
| Harley-Davidson | 1954 | Model K KH-900 |
XLT Touring 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1977–1980 | Sportster 1000 XLT-1000 |
55CI (883CC) OHV 4 Cycle-Twin 1 model
| Brand | Year | Model |
|---|---|---|
| Harley-Davidson | 1980 | Sportster Standard XLH |
Related Products
View all →
More from Gardner-Westcott
View all →
Who are we? Leeds Harley-Davidson - Iron City Motorcycles
This product is fulfilled by Iron City Motorcycles, Leeds' authorised Harley-Davidson® dealer, serving the UK with a full range of Genuine Motorclothes®, dealer merchandise, and official Harley-Davidson parts & accessories — available for UK and international delivery.
From OEM Parts to retro lifestyle wear to aftermarket stockits we have what you need to keep you riding all year round.
Use our official OEM parts finder to browse our full Genuine Harley-Davidson® Parts and our associated approved aftermarket catalogues.