A-margin and V-margin describe the gap variance on a vertical panel - A is narrow on top, wide at the bottom, V is just the opposite.
You gap the horizontal panels (hood, rear deck-lid) on the driver's side exactly - the panel gap on the passenger side is left to carry the variance (which makes sense since the driver approaches the vehicle from that side).
Plastic panels (plastic - not necessarily fibreglass) expand and contract more than metal panels hence require larger gaps (think Saturn).
And the Pontiac and Cadillac cars, not SUVs, the 'sclade is a stinking tarted up Tahoe, are getting much, much better than just a couple of years ago. I will be the first to tell you how junky Potiacs were not that long ago (crappy Grand Prix, hence the "Pontiac: We Build Driving Excrement") but I'll also be the first to say that they are much better now.
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