{"data":{"id":"us/49-cfr-appendix-c-to-part-564","jurisdiction":"us","citation":"49 CFR Appendix C to Part 564","heading":"Appendix C to Part 564—Information Applicable to Standardized Sealed Beam Headlamp Units","body":"I. Dimensional Information Specific to a Type of Standardized Sealed Beam Unit.\nA. Dimensions marked “I”, indicating interchangeability, for which conformance is mandatory.\nB. All other dimensions which are for design purposes.\nII. Dimensional Information Applicable to the Use of Nonadjustable Headlamp Aiming Device Locating Plates\nIII. Dimensional Information Applicable to Mounting Features, Including Mounting Rings and Lamp Bodies, Specific to a Type of Standardized Sealed Beam Unit\nA. Dimensions marked “I”, indicating interchangeability, for which conformance is mandatory.\nB. All other dimensions which are for design purposes.\nIncorporated Figures [References from 49 CFR 571.108, Oct. 1, 2006]\nLF Headlamp Dimensional Information [Figure 11]\nUF Headlamp Dimensional Information [Figure 12]\nLF/UF Mounting Features [Figure 13]\nLF/UF Mounting Ring [Figure 14]\nType G \u0026 H Headlamp Dimensional Information [Figure 18]\nType G \u0026 H Headlamp Mounting Information [Figure 21]\nType 1A1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 11]\nType 2A1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 10]\nType 2B1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 13]\nType 1C1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 7]\nType 2C1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 8]\nType 2D1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 5]\nType 2E1 Headlamp Dimensional Information [SAE J1383 APR85, Figure 15]\nTypes 1A1, 2A1, and 2E1 Headlamp Mounting Ring/Lamp Body Dimensional Information [SAE J1383 APR85, Figure 12]\nType 2B1 Headlamp Mounting Ring/Lamp Body Dimensional Information [SAE J1383 APR85, Figure 14]\nTypes 1C1and 2C1 Headlamp Mounting Ring/Lamp Body Dimensional Information [SAE J1383 APR85, Figure 9]\nType 2D1 Headlamp Mounting Ring/Lamp Body Dimensional Information [SAE J1383 APR85, Figure 6]","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER V—NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 564—REPLACEABLE LIGHT SOURCE AND SEALED BEAM HEADLAMP INFORMATION"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"fb84611c35e8d3b80acc1aeaa0945a40c26b5d45e44c0dec5a9f9e4bd64f44b7","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-appendix-b-to-part-564","next":"us/49-cfr-565.1"},"notice":"GroundRules: Original legal text. Not legal advice."}