Grips in this category came stock on Sterlings and were either made by/provided by Proline, G&H, Lada Precision, or Arrow Precision.
These grips should also fit one hole stock Autococker and Automag frames. Early Sterlings came with stock WGP swing frames and later sterlings used a cast frame made by Proline, G&H or Lada Precision.
Arrow Precision sterlings typically came (and still come with 45 frames and take 45 grips). The grips do not fit 45 frames.