William, I measured the front Lyman sight on my SC, it measures .150" in diameter and about the same in height if measured from the rib to top of bead. It looks like Lyman sells a vintage style white front sight but it doesn't give dimensions. Most Bradley sights were threaded sights, Lyman sights were a press fit if I remember correctly. Lyman sells both types.
I believe it was standard for all Parker SBT's to have dual ivory sights.
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