A new 1" headset to go with the forks, 1" inch forks are available from lots of outlets not sure if you want original ones or not originals may be harder to source, I have just fitted some carbon ones to a steel road frame, but would stick with steel for a P7, unless you want suspension, then not sure of 1" suspension forks, another thing to consider is the brake fittings, do the forks need canti bosses a hole for a caliper or mounts for a disc.