2G Arp head studs look too small

[Ces4rDSM]

I bought arp studs to go with hg replacement. I was installing head studs but once hand fastened all the way down theres not enough room for nut and washer to go to torque the head. What size should they be ? I have 207-5401 arp head studs. Please welp.

 

[stillrunning]

Plugging that part number into ARP's website says those are Main studs, not Head studs.

 

[Ces4rDSM]

Omg, noooooo how did I not catch that. So bad. Thank you so much for your help ugh another 2 weeks of wait to recieve the head studs sigh.