Bill,
Thank you for the pictures.
My 5-2-29 tudor does not have those slots in the body cross piece.
Tom,
Thank you for posting about the previous link.
Evidently some time in March of 1929, Henry changed the upper rear spring and how it was attached. The wood frame on the spring got smaller and brackets were added to the body cross piece.
Here are some pictures of the later upper seat spring from that previous link.
Does anyone have one of these springs with the smaller wood for sale?
Also, I need one of the brackets that goes on the body.
I have the earlier upper seat spring with the heavier wood/brackets that I could trade.
Thanks, Neil