Beam

[markf]

What is the difference between early and late bay beams , figment wise ? Bolt pattern on beam plates , or more than that ?? Thanks in advance

 

[sparkywig]

Mounting bolt spacing is the same as split buses up to August 1969.
That's the only difference I'm aware of.

 

[89Rallye]

Shows it best I think, drawing on the left shows the difference in the mounting hole.