artsci
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I tried to fit a facelift bumper on my older MS and the assembly tabs/holes at the top of the facelift bumper did not line up to the assembly hole area my pre-facelift MS.
All the areas around the headlamps lined up and snapped in. Yay.
The lower grille opening of the facelift is about double the size of my pre facelift autopilot grille. Boo.
The fog light opening on the pre-facelift was different dimension than the facelift. Boo.
Good thing my buddy at Tesla let me return the parts.
There are special parts to mount the facelift bumper on an older MS. Did you have them? Based on your post I suspect not.