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Guys,
a HTP is valid for a Period E/F/G/H/I/J for which there are sub-categories from G1-G2/H1-H2/I/J1-J2
So you declare a car for Period J1 as an example and therefore you can run all Homologation and Variant/Evolution included in the form for that Period, taking into account the year of specification to define the inner limitation within that Period.
Common sense for a Homologated car is to build a car to a Period and use the latest Year of Specification within that Period (F/1965 or J1/1985).
The Year of Specification is predominant for Two-Seater Racing Cars or Singleseaters as these are non-homologated cars and only built to period Appendix J rules, therefore, they are judged on that specific base and essentially, it means you can't run a Gurney on a 1970 wing as this was introduced only by "Dan the Man" in 1971.
On the question of a grid such as Peter Auto HTC, basically, acceptance of cars is based on the model having been Homologated before 31/12/1985 but specification can go up to 31.12.1986 included. But if you run a Rover with 1986 evolutions that doesn't give you the right to have J1 papers, they would still have to be J2.
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