Okay, here's what I found out:
(1) The side-discharge chute is simple 90-degree elbow fitting that directs the clippings from under the rear door out the left side of the mower. Part Number is 06814-VG4-010.
(2) You can remove the upper blade (closest to the engine) and just use the lower blade; this set-up might work better than the twin blades for your turf/lawn conditions. To make up for the removed lower blade, install the spacer kit, Part Number 06725-VK6-000.
Both parts can be purchased from any Honda dealer; here's a link to find one in your area:
Honda Power Equipment - Find a dealer
-Robert@Honda
Caveat: I work for Honda, but the preceding was my opinion alone.