Our '68 220D had the Kangol belts. They were sure simple to operate and seemed like way less fishing for the parts when you wanted to put them on. Like a previous poster pointed out, they held by overlap. Kinda like hooking the fingers of one hand over and under those of the other. They were so easy to release, as he said, that you can't get trapped in the belts in an emergency. Major disadvantage is you were pretty well strapped in when they were adequately cinched up.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150