Depends on the part. Many 1935 parts ("48A-" prefix) were used on 1936 cars. Generally, 1936 "first use" parts have a "68A-" prefix. A good example of overlap....the front I-beam axle on a '36 Ford should go by the number "40A-3010". The "40A-" represents a first-use 1933 Ford part. But, the axles stayed the same 1933 THROUGH 1936. So, a replacement axle for a '34, '35 or '36 Ford would be a "40A-3010"......not a "68A-3010". Clear as mud, huh? Good questions, though! It really helps ya to learn the basics of the Ford numbering system, especially those prefixes. By the way, that "A-" indicates use of a part on a "PASSENGER CAR and COMMERCIAL vehicle (commercial vehicle is a pick-up and a sedan delivery). DD