For the headstuds, go with the Golden Eagle studs for the Honda B16 (I think). Do a search. You'll find the info. Or you can go with the newly available option from Elite Auto Engineering. They look the part.
Or you can pay out the ass for AEBS studs or whatever they are.
For the other hardware, you can do ARP but the main cap bolts I think interfere with the upper oil pan and so you have to get some notches cut out and possibly some reinforcing done on the oil pan to use those. I don't know what to use instead. Honestly, stock will probably be fine. Or GTi-R maybe is an upgrade?
Or you can pay out the ass for AEBS studs or whatever they are.
For the other hardware, you can do ARP but the main cap bolts I think interfere with the upper oil pan and so you have to get some notches cut out and possibly some reinforcing done on the oil pan to use those. I don't know what to use instead. Honestly, stock will probably be fine. Or GTi-R maybe is an upgrade?