Civic EG

Ive got a 93 cx hatch. Didnt come with the rear wiper. But ive always wanted a hatch with the rear wiper, just think it looks better in my opinion lol. But Ive used the search, and i find topics on eliminating the wiper. But none on installing the unit. Anyone have any info on doing so?

pretty sure ill have to switch the interior dash wiring harness??