To identify a CURT multi-ball mount, inspect the receiver shank, number of welded balls and whether there is an integrated tow hook. Models 45651, 45652 and 45675 differ in receiver size, shank construction and individual ball ratings.
Compare the original CURT MPN and ball arrangement
| MPN | Receiver | Shank | Welded ball sizes | GTW by ball, small to large |
|---|---|---|---|---|
| 45651 | 2½ in | Hollow | 1⅞, 2 and 2⁵⁄₁₆ in | 5,000 / 10,000 / 14,000 lb GTW |
| 45652 | 2 in | Hollow | 1⅞, 2 and 2⁵⁄₁₆ in | 5,000 / 7,500 / 10,000 lb GTW |
| 45675 | 2 in | Solid with integrated tow hook | 1⅞, 2 and 2⁵⁄₁₆ in | 3,500 / 5,000 / 10,000 lb GTW |
Use each ball’s specific rating. These GTW figures are not interchangeable across ball sizes. Confirm tongue-weight limits and the ratings of the hitch, tow vehicle, trailer and coupler. The lowest applicable rating governs.
How to identify the correct replacement
- Locate the MPN on the mount and compare all three welded ball diameters.
- Measure the square receiver shank, not just the overall width of the ball head.
- Check whether the shank is hollow (45651 or 45652) or solid with a separate tow hook (45675).
- Compare the manufacturer's ball-specific capacities and hitch-pin retention, rather than trusting the highest number alone.
- Inspect for damaged welds, bent steel and corrosion; do not use damaged towing hardware.
Check matching hitch-mount photographs
CURT 45651 — 2½ in receiverLarge-receiver three-ball mount; pin and clip sold separately. Two pin-hole positions change reach, not ball height.Check item condition and availability
CURT 45652 — 2 in receiverHollow 2-inch steel shank with welded balls. Check the matching receiver opening and approved retaining pin.Check item condition and availability
CURT 45675 — 2 in receiverThree-ball mount plus a tow hook. Ball-specific trailer ratings do not establish a separate tow-hook working load.Check item condition and availability
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