the RPO's are the last section of the assy manual, not all listed, just the more complex, many of the options, especially trim, could be bought/installed at a dealer
the strips are SS, and they're not repro'd for the same reasons many things aren't - the extreme cost of tooling to make a part with very small demand, they'd need to be properly stamped unlike the end pieces which were repro'd by die casting and chromed - even those were a limited single run from what I've heard - and of course you'd have to choose which to do, long or short, if you choose wrong you could be sitting on $100,000 of SS for a very long time

.... decent complete sets seem to sell for 1000$ up
Bill