I recently restored a mid eighties Conroy(Glastron) trailer, the thread is on the site somewhere. The old winch is a Fulton T1802, and is 3.875" wide. I replaced that with a new Fulton that I cannot locate a model number on right now, maybe it's on the bottom of it. It measures out to be 3.565" wide. The channel it sits in is approximately 4.5" wide. It does have several spacer shafts to allow for not cutting a semicircle in the trailer structural component. My best advice would be to get the measurements of the old one, and do some research to find one that fits. I had to build a new handle for mine, so it's likely that an exact replacement may no longer be available, and a bit of customizing may be in order.