Will probably be Oracle 5400 for reflective, or Orafol 5600, both have better performance than 3M. It's a bit pricier but it's reflective and 5 mil thick and designed specifically for cars. So it should be thicker like factory. It's the same reflective stuff they use on emergency vehicles and has the longest guarantee of the vinyls.
The eBay seller is probably using 651 for the plain colors which is cheaper and thinner. But is good vinyl. We have made many decals with it that are intricate and holding well. Orafol and Oracal should have something also at 5 mil that is non reflective.
Depending on the price of the specific material as some like the 5600 can run a $3,$4,$5 per square foot (reflective vs non reflective etc) where 651 can be $1.40 per square foot. I was thinking between $30-$50 shipped max.
Should be noted white reflective will have a grey/silver tint to it.
1986 F-150|Standard Cab|4x2|300Six|C6Transmission w/3.08 rear|Name:TBD
2021 Ranger XLT Super Crew