[b2524]

I have a couple questions.
First off how wide is the spacer going to be?
I believe PCA and POC have a limit of 1/2 inch for track use. My mind is fuzzy it could be 1 inch but if you are thinking track use check the rules.
H&R or H&H make spacers in aluminum that are hub centric and use recessed steel wheel open nuts along with the factory studs to hold the spacer on and they use pressed in studs for the wheel. I have a set that are 2 inch and I have a set of 1 inch. I’d need to look at the 1 inch to see if they bolt on the same way. Like I said my mind is fuzzy haven’t looked at my spacers in a couple years.
Regarding press in verses double threaded I would go pressed in as long as you use the correct pilot hole for the stud. I think the factory knows best, you never see wheel studs threaded into aluminum.
I think the reason is wheel studs can be easily over torqued by a grease monkey which could cause the threads to start to pull out in aluminum. Another thing your typical grease monkey might not notice when a threaded stud has started to back out and before you know it only 2 threads are engaged and the stud falls out. Product liability issues.