Those studs should be fine with 20mm spacers. I have a similar set on my car and run 20mm spacers on the front.
The important thing is you have threads beyond the nut when tightened at at least the diameter of the stud. Note that they have a "bullet" end, so the usable length is around 75mm
I used blue locktite when installing the studs and have not had any issues with them loosening up and I change my wheels a lot. Yes some recommend using red, but I did want to be able to remove them without using a torch should I have to replace one. Some may also say they are cheap and will break and you need to get Tarett or Rennline ones at ~ $9.00 each.
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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