To identify an older CURT three-ball mount, start with its receiver shank and look for a built-in tow hook. The selected ball's individual load rating matters, even if another model has the same three ball sizes. Compare the manufacturer number and the exact shank dimensions.
Identify the old hitch mount safely
- Measure the original shank rather than inferring the receiver size from the number of balls.
- Look for a hollow versus solid shank, and the distinctive tow hook on 45675.
- Match the exact CURT number before comparing the separate ball-specific ratings.
- Check the coupler's stamped ball size and the trailer's actual loaded weight and tongue weight.
- Inspect welds, ball surfaces and the receiver-retention hardware; replace damaged towing parts and follow the appropriate installation instructions.
Compare original shank and ball ratings
| MPN | Receiver / shank | Ball sizes | GTW by ball size | TW by ball size |
|---|---|---|---|---|
| 45651 | 2½-in hollow shank | 1⅞ / 2 / 2⁵⁄₁₆ in | 5,000 / 10,000 / 14,000 lb GTW | 500 / 1,000 / 1,400 lb TW |
| 45652 | 2-in hollow shank | 1⅞ / 2 / 2⁵⁄₁₆ in | 5,000 / 7,500 / 10,000 lb GTW | 500 / 750 / 1,000 lb TW |
| 45675 | 2-in solid shank | 1⅞ / 2 / 2⁵⁄₁₆ in | 3,500 / 5,000 / 10,000 lb GTW | 350 / 500 / 1,000 lb TW |
Ratings are ordered by ball size (1⅞-inch, 2-inch, 2⁵⁄₁₆-inch), not interchangeable across other ball mounts. GTW means gross trailer weight; TW means tongue weight.
The lowest-rated component controls. Check the tow vehicle, receiver, ball mount, selected ball and trailer coupler. An integrated tow hook has its own appropriate use and does not inherit an unrestricted towing or recovery rating.
Check matching product photographs
Check the exact CURT number, listing condition and availability before choosing a replacement.
CURT 45651 — 2½-in hollow shankIts 2½-inch hollow shank is larger than the 2-inch CURT versions. Confirm the original receiver and MPN, including the correct matching ball rating.Check listing and availability
CURT 45652 — 2-in hollow shankLook for a hollow 2-inch shank and three black welded balls. The model is not a 2½-inch receiver mount.Check listing and availability
CURT 45675 — 2-in solid shankIdentify the tow hook alongside three hitch balls. Its 1⅞-inch and 2-inch ball ratings differ from those of 45652 despite the same receiver size.Check listing and availability
Need the right receiver hitch pin? Compare CURT hitch pin diameters and locks.
UsedRVParts offers product viewing and pickup by appointment in Kelowna; check the individual listing for condition.