When I replaced mine it came as a single length kit that is cut to length. It was long enough to replace all 4sections - bulkhead x 2 plus cowl x 2.
Bulkhead sections were easy to do. Cowl needs drilling out of rivets to remove the old, remember to use washers at rear of rivets when re-fitting to make sure they grip the new tape. Petroleum jelly then rubbed in for lube. The only awkward bit is riveting the wing ends as they are tucked away under the cowl and getting the washers in place is a bit of a fiddle.
I replaced the rivets with a screw and nut.
