They are nominal 1 1/4" x 1" x L=2 1/2", new in the box.
But keep in mind that... 1) actual pin diameter is only 25.0 mm or .984"
2) spring eye is not machined so a new bushing is never round or cylindrical once pressed in - which greatly reduces initial free play... but also contact area so they wear fast to fit to loose, to soon!
Best if one could find replacement bushings a little undersized on the inside and had access to a reamer to finish to desired diameter.
That's what I do with mine anyways, since most of the old pins aren't that bad and can be saved/ restored back to cylindrical shape by removing, turning, grinding down, one side only, less than 0.3mm (0.01") down to 24.7mm = .974" O.D. (no worries, hardness goes much deeper than that.)
G.