Welcome back to truck modeling. As for aftermarket vendors, there is Kit Form Services in England ( http://www.kitformservices.com/ ), there's Auslowe in Victoria, Australia ( http://www.auslowe.com.au/ ), there is Melbourne Model Truck Accessories out of Victoria, Australia ( http://www.freewebs.com/mmtaer/ ), there's P&P Vintige Kits & Resin Works in North Carolina ( http://ppvintagekits.com/ ), there's American Industrial Truck Models in New Jersey ( http://www.aitruckmodels.com/ ), & Plaskit Resin in Quebec, Canada ( plaskit_resin@yahoo.ca ). That about covers "parts" vendors.
For decals, there's Model Truckin in Mississippi ( http://modeltruckin.com/store/ ) & there's Doug's Scale Truck Replicas in Victoria, BC, Canada ( http://www.dougsscaletruckreplicas.com/index.html ).
There are probably more, but that's all I can think of right now.