Maybe your lucky day. Auto city classic has the uppers on special for $89/pair
http://www.ebay.com/itm/1958-1964-CHEVROLET-TUBULAR-UPPER-CONTROL-ARMS-HEAVY-DUTY-NEW-/351926413205?fits=Year:1961|Model:Impala&hash=item51f072e795:g:WbIAAOSwcUBYRfXB&vxp=mtr
Same import arms as those over priced Southwest Speed
I saw those a while back. I wondered if they had the added caster. Hard to believe you could buy material and have them shipped here for that cheap.