replaced both pieces on my '67, inner & outer. bought repops & they actually fit up pretty well. better than i expected. the dash top piece goes up to the first defrost louver, the one closest to the windshield. take your time, drill the spots out, & fit it up. when i did mine, i used the new one as a template to cut the rusted area out, made a flat backup strip 1" wide & long enough to go from the a-pillar to the defroster & tacked it to the bottom of the dash so you will wind up with a 1/2" of it under the dash & 1/2" of it exposed for the patch panel to rest on. leave yourself around 1/32" gap for a full penetration weld, tack it up good, & go slow!!! don't let it get too hot. no more than one second welds at a time. the backer strip will also help keep it from warping as you weld.