| Prefix | Manufacturer / Vendor |
| AD- | Advanced Turf Technology (ATT) |
| AE- | Aeoflex |
| AF- | Agri - Fab |
| AG- | AG-Tronic |
| AM- | Arps Manufacturing |
| AQ- | Ameriquip |
| AR- | Arnold |
| AT- | Atlas Pro Service (Canada) |
| AX- | Apex |
| BD- | Stanley Black & Decker |
| BE- | Bercomac |
| BF- | Befco Inc. |
| BN- | Bunton |
| BP- | Buyers Products |
| BR- | Brinly |
| BS- | Briggs & Stratton |
| BU- | Bush Hog |
| CI- | Curtis Industries |
| CM- | Comet Industries |
| CP- | Custom Products |
| CV- | Haulmaster |
| CY- | Cub Yanmar |
| DC- | Dana Corp. |
| DD- | Daedong |
| DU- | Industrial Wheel Company |
| EM- | Emak |
| HW- | Hein Werner |
| HY- | Hypro/Shurflo |
| IH- | International Harvester |
| IM- | Ishikawajima Shibaura Machinery Co. (ISM) |
| JA- | Jacobsen |
| KB- | Kubota |
| KD- | Kioti/Kansas Machine Works (KMW) |
| KH- | Kohler |
| KM- | Kawasaki Motors |
| KR- | Karcher |
| KZ- | Kaaz Corp. |
| LAB* | Humboldt Specialty Manufacturing Company |
| MA- | Mitsubishi |
| MC- | McCulloch |
| ME- | Onan / Linamar |
| MG- | Magnum (Spreaders) |
| MJ- | MoJack |
| MR- | MR Industries |
| MT- | Moto Alliance |
| NR- | North American |
| OS- | Ohio Steel |
| OTH* | Humboldt Specialty Manufacturing Company |
| P- | Proulx MFG. |
| PC- | Peco |
| PE- | Peerless Gear |
| PH- | Parker-Hannifin |
| PR- | Precise Path Robotics (PPR) |
| RG- | Ross Gear |
| RM- | Remington (DESA) |
| SB- | Subaru |
| SI- | Seats Incorporated |
| ST- | Sportech |
| SU- | Sundstrand |
| TC- | Tecumseh / Peerless |
| TE- | Turf Equipment |
| TM- | Team Industries |
| TS- | Turf Specialty |
| TT- | Tuff Torq |
| VA- | Valley Industries |
| VL- | Mile Marker |
| WD- | Willsey D (M&W Gear) |
| WG- | Wolf-Garten |
| WH- | White Wheel |
| WM- | Woods Manufacturing |
| WT- | Walter Mauser |
| YA- | Yanmar America |
| YD- | Pioneer |
| YS- | Cub Yanmar Sales |