Im not sure how it was with the k20… but with the k24, I had to get a crv mount for the passenger side of the motor. I can’t really explain this perfectly but the second hole back isn’t open. Therefore I needed to get a crv flange bolt which sticks up and then allows a nut to come down.
K20/K24 Swap Parts List Total cost: $2800 (See Inside) - Page 2 - Honda-Tech - Honda Forum Discussion
If you go to the second page, post number 50, you can see the bolt that im talking about.