The 47 and 48 were flat strips that screwed on. From sometime in 49 they used C channel with rolled over top edges that the windlace slid into from the end. These were spot welded on. We drill a 1/4" hole about every 4-6 inches and then hold the mig nozzle tight against the channel to spot back on. A tip here is to use a paint stirring stick cross ways across the channel to guide the nozzle so the spot is exactly in the center of the drilled hole. Just a few practice spot will have you hitting the bulls eye. Now, never, NEVER use any silicone spray/lube on the rubber or around anything that may ever be painted. Not too high on vaseline either. Use original white Go-Jo (not with lanolin), it's slippery as snot, won't cause paint problems, and washes or wipes off instantly with water. If you don't have a welder you can panel bond them on which is a better bond than either screws or welding. Just put an 1/8" bead on the back side and use screws to hold overnight. Back the screws out and dab holes shut. Panel bond is what holds your 90's and up Chevy truck door hinges to the pillar post and the panels on super sonic jets and space shuttles.