Yes it does, and there is a lot of back dating and updating done in IT.

Some of it perhaps illegal as I understand that it must be done, per the rules, as a complete assembly.

So, define assembly? 2nd Gen RX7s mix and match intake manifolds from one year car with motors and other items from another. Most thing this is legal, I do too, but at some point, the definition of "assembly" would prevent some of this.