True! A vac system runs the wipers; I have a 46 and that's the deal. Mac's (macsautoparts.com) has parts & conversion kit for '40 6 or 12 volt system. About $150.00 + S/H I have ordered from Mac's and had good response. Ron

Sources: macsautoparts.com 800 777-0948 free catalog! call or online request.

if you want to convert to electric wipers check these out http://www.julianos.com/electric_wiper_conversions.html