I see that they are selling on eBay new complete drivers door windows complete w/frame and passenger side as well, they look like they will fit the M37 because they look alike. These new door windows are for the M35 series trucks. I just bought two new split windshields compete with frame for the M35 trucks and installed them and they fit perfect, matter of fact they fit better than the old ones. I only bought the new ones because the glass company's here in town are gun shy in replacing the broken windows, plus my frames are a bit rusty as well. I have called around to a few places that advertise in selling these for the M37 but are out of stock as always.