The honda rep was clueless... You can buy a single rocker arm assembly, but they are expensive... As in like $250+ new from the dealer.
Would be cheaper to find someone with a damaged head and buy it off of them, or just buy a complete used head.
Also, check the forsale forums over on
D-series.org .
You will need a rocker assembly specifically from a d16z6 so 92-95 civic ex/si.