| Part No. |
Upgrade Tier | Core Role | Cross-Reference Parts | Fit Engines | Key Applications | Popularity |
| 3028997 |
Base Universal (Original Core) | Genuine OEM benchmark, core cross-reference prototype | 3411460, 3068724, 3008493, 5275195, 181827 | NT855 Big Cam II/III/IV, NTA855, N855 | HD trucks, buses, construction equip, gensets, marine | ★★★★★ |
| 3068724 |
Same-Gen Optimized (Early 3028997 Upgrade) | Heat dissipation optimized for Big Cam series, fully compatible with base model | 3028997, 3411460, 3008493 | NT855 Big Cam II/III/IV, NTA855 | HD trucks, construction equip, gensets | ★★★☆ |
| 3008493 |
Base Compatible (Same-Gen Simplified) | Cost-effective genuine entry model, retains core specs, full compatibility | 3028997, 3068724, 3411460 | Full NT855 & NTA855 Series | Light-load HD trucks, buses, small gensets | ★★★ |
| 3411460 |
Cross-Model Upgrade (Mid-Term 3028997 Replacement) | Upgraded structure & durability, wider fitment, pre-prototype of 5275195 | 3028997, 5275195, 3068724, 3008493 | NTA855, N14, NH220, NT855 Big Cam | Heavy construction, large gensets, marine, mining | ★★★★ |