Found a pic of how it fits in the cubby. I was planning on buying the 8”, it it’s not really much smaller than the 10” kicker. I’m sure you couldn’t go wrong with either size, and there are lots of manufacturers of similar sized powered subs.
The wiring in the cubbyhole is still a mess as I haven’t gotten around to cleaning it all up. I added the sub and the wiring for the backup cam, trigger, power tap, and the Sirius antenna I ran all run thru there.