To save money, because I am very limited, I'd use a link from a chain, or maybe a rusty quick link.
Don't care how it looks, just how it works.
I have all sorts of odds and ends handy.
I did splurge and bought a case similar to the ones Sunil sells, but bigger. More space, being as the set of boards I bought take up a bit more space.
I will measure what I have, and actually make paper cut outs to fit on a sheet of paper with the width and depth drawn on it.
I did that kind of things many years ago, to figure out how to fit furniture I had into a small bedroom.
Worked out quite well.
Anyway, don't know if I'd need an alternator filter with my truck.
Have only run a dual band, or just a 2 meter rig, and a CB that I used while I was moving.
Comes in a bit handy when you are out of range of much of anyone, as well as repeaters.
I only recall vaguely getting a bit of alternator whine, maybe in the 70's, but not what vehicle it was.
I have had a lot of vehicles through the years.
My current main vehicle is a 1983 Dodge RAM250 pickup.
And I don't recall hearing any alternator whine from it.