You need to remove the door top . There are 2 bolts front and rear in the edges of the door ( under rubber caps, if still there), then the top lifts off ( watch for the placements of the steel shims). Then unbolt a pair of corner brackets and slide the frame apart.... It's been over 6 years since I changed mine... I might be a bit fuzzy on the details.... or I was drinking
Cheers
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The Trojan Horse... the 1st Pinz used to covertly carry troops into battle .
ATL Pinzgauer XM 718K TUM(HD) 6x6 FFR (aka The Green Grail)