Brazillian C10 - Lowering Springs?

[Junior_BnU]

Hey guys, how are you?
I would like information about C10's lowering springs.
Here in Brazil we have these springs (original):









We don't have a specific lowering kit, so, I cut the spring.

Is there any lowering kit there in the U.S. that is equal to these springs measures?
Summit Racing send to Brazil, but they have a lot of types.

Appreciate the help.

Greetings from Brazil,
Junior.