Good luck, I used to sell these. These are not new units. They are used parts, put together.

You will need to get wiring up to the navigation drive. Also, you will need to cut the navigation drive bracket, as the unit is too fat to fit inside it.

I repair bm53/54 units. You are better off getting yours repaired. I use more powerful amps, with a large heat sink so the amps do not overeat.