Bike Shocks?!?!?

[rapidtornado]

Apologies in advance if this is a stupid question but can anyone tell me why a rear adjustable bike shock, 10mm bolt hole, 355mm eye to eye and rated with a 250lb wouldn't work on our cars? they exactly like the gaz ones?

Not that I have some lined up but the range of shock for bikes is immense and I'm sure I could track some down

I'm sure there is a logical reason why not but I would be keen to learn why

Cheers
Rapid