I assume you have the 7 inch headlamps, the same as used on almost everything in the past, the bigger flat glass with tripod types you speak of do have entirely differing buckets, much larger, are offered up from behind the cars front panel, then there are a couple more mounting rim / bracket things, mine are dismantled at the moment so will take a picture next time I'm at the workshop, then you can easily see what's needed.
Just a thought, the 770 having no lens, has beam focused by the shaped reflector, these appear symmetrical thus I suspect that there may not be a difference between LHD / RHD, possibly the bulb positioning? Or is dipping to left / right a 'modern' innovation.
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