(typical outside)
The front door is another story, because the gasket between the two door halves does not permit a direct ("normal") mount of the lockset. After some thought/design (engineering?), I found a workaround that would still allow the doors to close unhindered...Used a piece of thicker (16 ga) stainless steel plate (screwed to the rear half) as a mounting plate for the receiver; mounted the lock to the front half, and ground down the receiver a bit to get the clearance needed for the two halves to close without catching.
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The keyed portion of the lock had to mount right where the bus door vandal lock plate was, so to cover that gap, I used another piece of stainless plate.
I know that there are other ways to skin this cat - such as putting a whole new door in, or changing the way it opens, but I wanted to maintain the original school bus look. Only drawback is that if I push too hard on the door, it can engage the interior safety latch, which means crawling through one of the other doors...or the roof hatch if I've locked all of them and left the keys inside (as I did on my recent road trip...