Look for the Monroe Severe Service version.
That Monroe coil over shock is a Sensa-Trac based shock with coil combo. As you know, everyone on this list prefers the Severe Service over the Sensa-Trac shock. There used to be a Monroe Severe Service /Gas Magnum version of the rear shock ( 550013) with a Load Leveler coil over with a p.n. of 550052. That p.n. has been dropped apparently from the Monroe catalog. I 'e mailed' Monroe and they told me to try p.n. 550053?! That's not a good p.n. either. Try to locate the Severe Service /Gas Magnum shock with the coil over for the best one for the B body.