So the mounted measurement is 14 1/2 inches???
Jack the front up so the axle can hang and measure --that will be extended length---now let the car down til it bottoms out on the travel--that will be your compressed length-- you want to pick out one that will fit those 2 diminsions with the 14 1/2 number pretty much in the middle of that travel---these numbers will be the same no matter what the angle, weight or $$$$$ are.