Cut one of the fittings off the hose and compare it to new fittings at the dealer, that way you can get the size. Or cut the hose and measure it. Engine brands are the best choice for fuel hoses. A few years ago, a 3rd party was selling a grey hose that had several problems once it was a few months old. So for a while everyone was advised to avoid the grey hoses. Now even Mercury and BRP are sell grey hoses. The price difference isn't too great and you know you are getting an approved product. As good as the original, which is what wore out or failed in the first place:facepalm:.