I have these NOS Distributor Arms ....not sure if this
is what you need.

see: PICS @ photobucket

http://i669.photobucket.com/albums/...uumControlClampArmsGMNOS_zpsb218a532.jpg

http://i669.photobucket.com/albums/...dist/vacuumadvanceandarm_zps8950ee45.jpg

http://i669.photobucket.com/albums/vv57/glp0329/VacuumAdvanceClampArm_zps36dc1bdc.jpg

Mine are not for sale.
In my parts manual
GM # 2.414
GM # 1873369
application: '39 to '57 ALL 6-cyl. (exc.52-57 pass.)

Dan's Obsolete in Montana has one in stock.
406-357-2615

Last edited by '54 3600; 09/08/2013 6:06 PM. Reason: added photo
1954 3600
A big help to many on the Bolt
Now cruising in
The Passing Lane