keystone Fuzion question

Recently made a change in trailers. Went from a 322 fuzion to the 385 fuzion. Where can I find replacement parts online that carries the same parts keystone uses? In the 322, the tv was on a wall mount that swung out and was able to be carried outside and watch tv.I'm looking for the hardware from a 322 to do this to my 385. When using the tv outside on the 385 and you need into the passthrough you have to take tv off the coach to achieve this. Poor design i think. Keystone uses those slip in plates that look like a V shape.