Parker will allow any lighted nock. The ones that fit the Red Hot are the Lazer Eye made by Carbon Express. The Firenock "Y" will also fit.
arrowhead I think you mean any lighted v-nock,and it used to be the firenock was the only lighted v-nock to fit parker arrows,apparently now carbon express has their own nock but maybe parker is unaware of these.
Sniper 370 / victory X bolts / shockwave 100grn / KI lumix with speedring (mine)
Parker Tornado (sons)