Well, let me throw a wrench in and let's see where it goes.
It could simply mean that parts off any cars on a single spec line are completely interchangeable. However, since this section of rule is only talking about backdating/updating - meaning putting parts from an earlier or later model car on yours - not about general substitution of parts. Read in that context, the reference to a single spec line could be simply to the model years on a single line, not body types, and the restriction to same body type would still be in effect. I.e. you can put a tranny from an '87 or '89 coupe in your '88 coupe but not in a sedan or convert. The rule goes on to say that you can't "create" a model car that never existed - so, e.g. if sedans never came w/ a 5-speed, you can't take a 5-speed out of a coupe (of any model year) and put it in a sedan even if the coupe and sedan are on the same line. But if sedans didn't have 5-speeds until a certain listed year, you can update your older car, that did not come w/ a 5-speed, w/ a tranny from a later sedan (but not a coupe). However, if the 5-speed that came in coupes and later sedans is exactly the same, I don't think anyone is going to quibble about where it came from. I have not even considered the ramifications of this interpretation - I'm just reading the rule.
Bill Denton
02 Audi TT225QC
95 Tahoe
Memphis
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