lower ball joint

Hi,
does anyone knows the part number of a lower ball joint to my dodge dart?

it is based on a 68/69 dodge dart with disk brake

the cheaper one I found in ebay is a moog k781 based

don't know if will fit
http://cgi.ebay.com/ebaymotors/ws/e...0351568180&viewitem=&sspagename=STRK:MEWAX:IT