will a loader off a M hook right up to my H?

If the loader was a model 33 or 33A the spacer plates are not used or either tractor as the loader mounts different in the front. On these loaders there is a triangular shaped mount that attaches to the rear axle of the tractor and then there is a tubular bar that runs from the top of that mount in the front down to the side frame rail of the tractor. There should be 2 holes in the end of that tubular bar and 2 holes on the frame it mounts too. This is how you change the width of the spacing on these loaders to fit either tractor. Where it meets up with the frame rail it will align with a hole on the siderail which you can then put a bolt in to attach the front point. These loaders are MUCH MUCH easier to put on and off if you plan on taking it off much. They simply pin on at the top end of the lift arm and pin on at the bottom of the cylinder. Just unhook your hydraulic hose and take the pin out of the bottom end of the cylinder and rest the cylinder on the ground. Now unhook the top pin and back the tractor away and the loader should stay right where it is. This stlye of loader has a curved pipe framework from the rear bracket it mounts on down to the bucket pivot. These will work with wide or narrow front tractors but they AREN'T nearly as stout as the other style 30 or 31.

We have both a 31 and a 33A loader here at our farm and have had both on H's and M's over the years. If you have a narrow front and want something a little tougher that you won't need to put on and off a lot get a 30 or 31. If you have a wide front or want to use it for lighter work or take it on or off frequently get a 33 or 33A. This is all assuming that it is an IH loader. There are others out there and like Allen said any can be made to fit with enough enginuity.

Just my opinion and two cents for what they are worth.

Like these other fellas say tho, the difference will be in the mounts.

Genereally speaking, any loader will fit any tractor. Tools required: welder, torch, chop saw and a decent supply of scrap iron and bolts.

Allan

Gary