I have a quick build kit. It came with the engine mount already attached. Not permanently you have to reattach it and torque it correctly… But the bolts that it comes with I found not to be long enough to attach the cleat that holds the parachute cable in place. Luckily, I had already purchased an assortment of an bolts from aircraft spruce. So I got the next largest bolt and it now sticks out a couple extra threads longer than the nut, as it should.
I wrapped the, Cable in vibration resistant material, street name electrical tape. My concern was that it would vibrate against the cleat or the wall of the plane and create noise or wear. I also put some edge protector around where it goes through the avionics hole.