Ok after measureing,and e-mailing pics and more measuring i think i finally got the motor mounts for my 54 pontiac pathfinder figured out.Its the 239 inline 6 by the way.Final confirmation  was the arrival of my steele rubber catalogue with lots of nice pics and measurements.So a 1954 canadian pontiac on the passenger side uses a 60-0295-11,which originally was a 377928 which lists as for a 1935-48 chevrolet.The drivers side uses a 60-0224-11,originally a 756056-7 again listed for a 1935-48 chevrolet.|I guess maybe canada got stuck using up excess parts,although i seem to recall that you could get a 239 in a 48 chevy truck.Anyways of course neither is actually availible through steele rubber but they do offer a re-vulcanizatiion service if you send in your cores.I did find the passenger side on ebay so maybe now i can find the other.I would have ordered two of each(their sold in pairs) and had an extra set but that would've been ok as i probably need a set for the panel as well.According to steele it would be about 100.00 and 3 weeks to get my cores re-vulcanized.