1965 Dodge Dart Charger
I have one of these and this is the type of spot welder they would have used. Search Lenco spot welder there may be one near you.
[ame="http://www.ebay.com/itm/LENCO-LENCOSPOT-MARK-II-L-4000-SPOT-WELDER-480-VOLTS-SINGLE-PHASE-/161219758108?pt=BI_Welders&hash=item258972481c"]Lenco Lencospot Mark II L 4000 Spot Welder 480 Volts Single Phase | eBay[/ame]