I know there is a cosmetic difference between wood firewall brackets and those used on steel firewalls,but is there a difference is bolt spacing,etc. Could they be interchanged? Thanks,MIke

Mike

Same hole centers.

Here are 3 types of the mount to side of frame firewall bracket.

The steel firewall uses that carriage bolt version with the sq holes.

The main difference is where the frame bolt holes are. The brackets for wood firewalls sit closer to the front of the car and the ones for metal firewalls are closer to the body for the thinner metal firewall. No they are not interchangable unless you change the firewall.

I was thinking the difference was that the earlier brackets had a little less width in the webbing that allowed for the wider firewall thickness of the wood firewall. The older and newer brackets are identical other than the difference in the different width of the angle webbing.
I will check my 1919 Roadster tomorrow to make sure as it has wood firewall. I have a 24 Coupe to compare to the 1919 to see if the bolt holes in the frame are the same also. This has got me to thinking. I was thinking that they were.

Look at the side view of brackets. It shows difference in wood/metal firewall. The holes are all the same,top and bottom.

Thanks Jack. Thats what I was thinking also.

I believe the one in the center is for a '26-7. Also, the 24-5 firewalls have the square holes, and the brackets have the round holes as pictured on the left and right brackets.

Thanks to all for the help.