Boss used hoses that looked very similar on the ends but were either 1/4" or 3/8" MP. Our listings are very clear with hose sizes and fitting sizes. Each of our numbers list the OE number to verify you are ordering the correct part. If you don't have the OE number you can start by measuring the length of the hose and then by the size of the end fittings. Hose lengths. include 12", 15", 15-1/2", 18", 34", 40", 42", 44", and 48". Some of the OE numbers include HYD01695, HYD07020, HYD07042, HYD01606, HYD01696, HYD01702, HYD01707, HYD01810. Included with the hose section of our selection we carry the hose fittings. This includes 90 degree fittings, swivel fittings, street elbows, tee's and the straight swivel.