I have some 5 and 10 mm H&R spacers that came with longer studs, the 10mm are hub centric, the 5mm are not. I am not going to be able to use them so if interested let me know
Studs are not terribly difficult to install and a good idea when using spacers to ensure enough threads on the lugs nuts.
They are likely stronger than stock studs but I have not checked on that as did not intend to use them as have ARP race studs already installed.