Found this site while searching. Claims to have all OEM and aftermarket parts for sale. Looks like some stout parts also. The dash cap looks pretty decent. : http://toyheadauto.com/Web_Site_Directory_Toyhead_Auto_Restoration_Services_and_Parts.html
Don't buy the dash board cover it will peel off and come apart plus the plastic really warps if you live in a hot climate. Save your money and get it professionally wrapped. Also the interior mirror for a 78 hilux is not the same as the oem one. Its totally a different configuration. Other than that he does have some good stuff.