I remember the diagonal arms pivot on some sort of rubber bushings, right? Can those bushings be checked and replaced while you are at it?
I’ll take a look at the diagonal arms and the Bentley manual to see. If there’s bushings in there I will replace them!
Yes, the bushings wear and usually need to be replaced in an older car, especially if the car has been driven spiritedly (or if you're building a Speedster and are planning to).