I have had a lot of 45s and I have only seen the simple door top on fixed cabs,63,64, all my lwb trucks,64 and up have had the top door flange,and all my 64 thru 65 and even 66 had bugcatcher doors.The fixed top doors are a little taller,about an inch.I recently tried to put the fixed top doors bugcatcher weatherstrip,in the later removable top bug doors and they are indeed too tall. Also 65 was a crazy transition for landcruisers,so you could end up with many different combinations,no vent windshield,with bugs,or vice versa,and these were titled too early or late,and I believe at the end of 66 toyota was assembling trucks with what ever was left from previous years,so it stays interesting to figure out these old trucks.Then there is the heaters,all of my lwb trucks have had them,but some didnt?