I’m not finding anyone that currently carries suburban tail lenses. Americanclassic.com used to carry them under part number TLL6P, but currently show them as discontinued:
http://www.americanclassic.com/asp/d...ype=to&exyear=
Although there are a pair of used lenses on Ebay currently:
http://www.ebay.com/itm/60-66-1960-1...sories&vxp=mtr