No they are not. Cadillac for example has cars like the CTS that have specially made seat covers for the seats because of the way the seats are made they would not fit a normal seat cover.
the size that fits...
No the standard toilet seat covers are for the standard round toilet seats. The universal will fit the long oblong shaped toilet seats.
Purina manufactures colorful pet car seat covers. They build them for cat or dog size. The seats are very comfortable, high quality, and easy to clean.
Tire covers can be purchased at most car dealers or repair shops or even home improvement stores such as Costco or Home depot. Just make sure the size fits the tire.
The Sahara covers most of north Africa and is about the same size as the contiguous 48 states of the United States.
Convenience - a passport fits neatly into the hand of most people.
It depends on where it is going to be place but a 3.5ft by 5.5ft table fits six comfortably.
"Daybed covers are available in twin, full, queen, and king sizes from most vendors. Use your mattress size to determine the size for your daybed cover."
the answer is yes and no because the king only fits the king size. the quenn mattress size only fits the queen size fits and the small well it only fits the small.
You should have the seat professionally relocated. Certainly you do not want it to shift during a quick stop. Alternatively, buy a car that fits your size.
Most two seat sectional sleepers come with full size mattresses. Three seat sectionals come standard with queen size mattresses.
Boat cover sizes are measured by how many feet your boat is. The average boat size is probably less than 20 feet. Boat covers generally come in a universal size that fits several different size boats. For example a cover can come in 17 to 19 feet or 20 to 22 feet.