armrest replacement

I just installed the JJ products 6" drivers armrest on my 2019 Ridgeline today, It seems to be high quality and the leather is a perfect match. The install was no problem, It took less than 5 minutes from start to finish, but, here are my problems. For one, the 6" arm rest is a coupe inches...

Does anyone have instruction on replacing the leather arm rest? Just the top sliding part?