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Hi m,
On my 71 there are 2 very different screws.
The 2 for the front are shorter but are a machine thread. The headlight door is threaded to receive them.
The 2 on the sides are longer, but are a pointed, self-tapping type screw that threads into a u-nut.
I don't see any sign of collars on my mid-January 71.
Regards,
Alan