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Assembly quality is identical to the original ones. In fact they seem identical other than a few very small markings / numbers on the backside.
You can find the install instructions on the "unnamed" vendor's website. Look in the lefthand column for the install instructions link, follow it and scroll to the bottom.
They have good pictures but the bottom line is both the Original and replacements are held in place by two large plastic clips/prongs.
It definitely explains why some folks have felt their markers are loose . Mine were actually pretty darn tight, but no big deal to get out.
Thanks much for all the info, I had the "unnamed vendor" put on his list for a set of rears which should be done soon.