The Parker-Hale 5D (PH5D) was specifically designed for the Lee-Enfield smallbore family of Rifle No.7, No.8 and No.9. While very similar to the PH5C, the position of the mounting plate holes are different. If you have a PH5D in good working order, I have Rifles No.7, No.8 and No.9 that are dying to meet up with a very nice PH5D.