We have shops here that build completely new ones, like original, both for trucks and cars. For racing and for normal driving.
But they have no competition in Sweden, all alone. So they can charge whatever. So that's what they do !!
That's why we have to give it to someone who "almost" is as good... and maybe know what they are doing.
It's balanced alright.
But I know, if you do it correct you should take out all three of them together, and have them balanced as one unit.
But here.. nope would cost a fortune.