There's nothing that is 87Nn. 7 ft-lb is 10 Nm. (As in every one of the bolts is the same.)
As a side-note, make sure you use a low-range torque wrench. Even if a general-purpose 3/8" wrench will read down that low, you should really use a 1/4" wrench, as you can't really rely on the precision of a wrench operating at the bottom of its range.