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I think this is the answer to my question about the Group A BMW 635. It looks like it is specs to a particular year in the J1 or J2 period.
See Appendix K:
7. TECHNICAL REGULATION FOR PRODUCTION ROAD CARS
7.1 General
7.1.1 These regulations apply to Touring Cars, Competition Touring
Cars, Grand Touring Cars, and Competition Grand Touring Cars,
and Special Touring Cars as defined in Articles 2.2 and 2.3.
7.3.2 Touring, Competition Touring, GT and GTS cars of Period
G2 (1/1/1970-31/12/1971) onwards must comply with the
Appendix J international Competition regulations appropriate to
the final year of their period as defined in Article 3. This concerns
in particular the possible coefficient for turbocharged cars in
Periods J1 and J2 respectively.
a) A Period J1 or J2 car must be prepared to a period specification
complying with both the Homologation Form and Appendix J of a
specific year within the period.
2.3.5.1 Post 1946 Competition Touring Cars are either:
(a) Models of limited series production of Periods E till I (1/1/1947-
31/12/1981) derived from a model of series production Touring
Car and upgraded within the limits of period Appendix J and
including cars homologated by the FIA in Group 2 before 1966.
(b) Models of 1/1/1966 onwards which were homologated in Group
2 or Group A and conforming to the period Appendix J.
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