REPLACE FASTENERS!!!

Lesson learned the hard way (one, two, three):

• Either plan on replacing fasteners and grommets that are in your way;
• Or remove and inspect them before ordering replacement parts.

It's the tradeoff between your money and your time (which is, by the way, also your money, and also non-renewable, unlke money).

Latter practically means doing the job twice and in some places that means risking weakening parts that are extremely expensive or troublesome to replace (trailing arms, engine covers, head and body), so just bite the bullet and buy extra fasteners and grommets. They may not be cheap, but at least you won't be caught unprepared with your car non-driveable, or have to do the job twice.