I see many suspension struts have relatively large diameter coil springs. Like 6”-7” diameter OD. And many aftermarket coil over springs are much smaller or more compact. Say in the 4”-5” dia. Obviously the spring seat would match the spring dia but the wheel offset or backspace may not change. So, why are original springs so “bulky”?
I imagine @Mustangman can give a better explanation, but the small diameter ones have adjustable spring perches, meant for more custom/performance installations.
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I was thinking the same thing…lucky for us to have a suspension engineer hanging around!
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I agree, the top picture is of an OEM or OEM (stock) type replacement…
The 2nd pic is of aftermarket adjustable coil overs, they have a ride high adjustability that the OEM or stock replacements don’t typically have…
We have a brake, steering and suspension engineer on here???
Only kidding sir, the upmost respect to and for Mustangman…