When my distributor bearing went bad in my 1992 civic, I had to replace the entire housing case because the bearing was not available by itself. There is no part # for the bearing because it is not a dealer part item. They will only sell the entire housing/case.
example:
http://www.hondaautomotiveparts.com/aut ... +%28TEC%29
(this is for 1992 D15b7 - may not be accurate for your engine since different years used different distributors.) Also the D16z6 and D15z1 use a different distributor housing than the D15b7 and D15b8.
It is more common for the bearing to go bad in 1992 models.