Ultima Black Super Mini Oil Cooler Kit 73-33 Harley Chopper Bobber Sportster.
The Ultima part number 73-33 is a black Super Mini Oil Cooler Kit distributed by Midwest Motorcycle Supply. [1]
Because it is a universal-fit accessory rather than a model-specific factory replacement part, it does not have a strict list of exact matching years and models. Instead, it is designed to fit a broad range of custom and classic motorcycles based on frame dimensions and line plumbing.
Primary Applications & Makes
This kit is primarily manufactured for Harley-Davidson and custom V-Twin motorcycles. It is highly popular for: [1, 2]
- Custom Choppers and Bobbers: Built using aftermarket frames or custom V-Twin crate engines (like Ultima, S&S, or RevTech).
- Harley-Davidson Sportster (XL) Models: All years, especially older air-cooled carbureted models where mounting space is tight.
- Harley-Davidson Big Twin Models: Shovelhead, Evolution (Evo), and Twin Cam engines built across generations from the 1970s through the 2010s. [1]
Physical & Mechanical Fitment Requirements
To determine if this kit will fit your specific project, check these universal constraints:
- Frame Clamp Size: The kit uses a universal mounting clamp designed to wrap around standard 1-1/4" (1.25 inch) frame downtubes. This is the standard frame tube diameter on almost all Harley-Davidson and custom aftermarket frames (like Paughco or Kraft Tech).
- Plumbing Style: It features standard barb fittings designed to tap into generic 3/8" oil lines. It cuts directly inline with your existing oil return line coming from the oil pump or filter pad. [1]
- Compact Footprint: True to its "Super Mini" name, this cooler is highly compact. It is intended to tuck tightly alongside the front frame rails to keep a clean look while providing auxiliary heat dissipation for high-performance or hard-ridden air-cooled engines
Selling as pictured, save on shipping by coming to store in Butler, Pa.
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