No problem there! You call the body shop tell them your concern and ask them to extend the rental car before it expires.
IF they tell you it runs out and you will have to pay any part of it you then go to the insurance company adjuster explaining the situation to them. IF they say you have to pay any of it you climb right up his / her ass reminding them you are the claimant and you went to their pro shop.
Sometimes the insurance company will shut off the rental making the body shop responsible for taking too long.
Either way you are the claimant and have the right to have the rental car until your car is done without cost to you.
I've been watching this closely, I'm in a nearly identical situation right now.
My Fiancé's car got lightly wounded last month, and the car has been at the body shop for about 2 weeks now waiting on the insurance company of the dude that backed into her to get off their asses. The body shop is run by a family friend so I know it will be taken care of properly, but still, driving around in a clunker Nissan for several weeks gets old fast.
They called me and said the car is now in the shop... within 1 hour of taking off parts, they found more damage and have submitted a "supplemental claim" to the insurance... I said no problem, take your time, keep me posted.
Oh and from here out, don't ever tell a body shop to take their time. You will inadvertently take your car off the hot list. There are always customers on them to hurry hurry hurry. In their face all of the time. Yours can get pushed back if you are not in a hurry.
You tell them no hurry about three times you will be back in a month asking how to get them to get back on it.
True! Just happened to me but it's in my favor. The car was in storage so when I asked a shop to finish sanding and buffing it out they said they could do it but it might take some time. I told them as long as the car was indoors my insurance would cover it so I'm not in a hurry. They assured me they would put it in the basement and work on it a panel at a time. So now I'm saving $90.00 a month which will help pay for their services!
I tried those Supernova LEDs in my Jeep and they were pretty bad. I think it has a lot to do with the reflectors. The stock halogen bulbs were about the worst I've seen in a vehicle made in the past 30 years. I wound up putting in some JW Speaker LEDs. I'm pretty happy with those. The originals in the Jeep were downright dangerous.
Also try an automotive paint supply store for the clips. They will have an assortment of choices which will give you a better chance to get the right size. After all, they’re the ones that sell to the body shops. Won’t be the cheapest way but not the most expensive either. Should be able to get a dozen for the price of one at the dealer.