Nope, but you might be? 4 of the 5 listings above are for RM21 RR's. RM21 is a 'post RR' while RM23 is a 'hardtop' RR. You're 20% right but 80% wrong.
Your last link is a RM23 RR 4spd that didn't appear when I searched last night for 1968 Plymouth Road Runner and still doesn't show up when I search now. However, the posting has been up for a while (August 20). It's a late build '68 yet the description doesn't say if it's a numbers matching engine so it's probably not. The under coating on the bottom could also be hiding stuff. For $36k it's a little over priced which is why it hasn't sold yet. Great color though!
