Suspension upgrade?
Thx. I shoulda known that. Lol
Some spring companies will customize the order for you.
For example my Mopar has an oval (nearly worthless, potentially a flaw) leaf spring bushing for the front of the spring, I could change the order to the typical round bushing hole and can ask/pay for more leafs (sort of a pickup truck gain of carrying capacity vice performance, but if your car mostly sits and you will never sell it, 5 or 6 leaf springs will keep the stance for 20+ years.
I bought Super Stock leaf springs for my 73 road runner and they ride real nice 20 years later and keep the stance up.
Many can disagree or pick apart my logic certainly.