I have a 73 FJ40 with a newer top and ambulance doors. I found the reason for the gap at the top of the front doors between the windshield. I also found the rear sill on an older tub needs to be modified with a step if you are running a later top with ambulance doors. I apologize if this is posted somewhere, but for all the searching I have done I have not been able to find any measurements for the step that needs to be in the rear sill. The closest I have come I read where one guy used a 1/4 plate to make the step. Can someone either point me in the right direction or post up the measurements? How far does it step down from the bed 1/4? and how far from the edge of the bed? How much is the area recessed where the latch is? Also, I have read several posts where some say to make the ambulance doors fit right on an older tub, you need to recess or step the sides of the tub where the doors go. Others say there is no need to mess with the tub the doors overlap it. What are the pro's and cons of doing it either way? I want to make this a semi daily driver and would like the doors to seal at least as well as expected with these old rigs. Thanks for any assistance you can offer.