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Help with B&J Grover Monorail

Mine measures approx. 70.5 cm long and 2.5 cm
 
Thanks, I can get 25mm x 500mm Aluminium from one source, longer from others. I'd guess the original is actually 1"/25.4mm as the US wouldn't have used any metric sizes back when the camera was made,

Ian
 
1" hex is correct on my 5X7 Grover.
My eyes aren't what they once were but the milled rack appears to be 13tpi.
 
The rail is 20 3/8".
Catalog states that we have up to 22" of bellows extension.