BSA / P17 scope base, looking for

I have one of these rifles in 303British cal. The receiver was tapped and drilled (presumably by BSA) for Parker-Hale bases #3 front and #4 rear. The previous owner had fitted Weaver #35 front and #36 rear bases as the screw spacings exactly match the drillings for the Parker-Hale bases. Presumably he had done this because of the difficulty and expense in obtaining Parker-Hale rings. Unfortunately the Weaver #35/#36 combination, intended for Remington 700 series and clones, does not have the correct height differential front to rear to put the bases into alignment. There is a 21 thou' discrepancy. Also the #36 base has a larger receiver face radius than on the rifle so the base can rock side to side. Probably this caused accuracy problems so he sold the rifle. Lucky me! The BSA-Enfields receiver top faces were reground to the profile of a Winchester model 70. The correct bases are Weaver #46 front (vintage long-tube scope) or #402 front (modern short tube scope) and #47 rear. Unfortunately you will have to get one new hole drilled and tapped in the rear receiver ring to fit the #47. It is possible that a #49A will fit in place of the # 47 without re-drilling as the height and radius are the same, but I have not been able to ascertain the hole spacings in the #49A from my source. http://www.brownells.com/aspx/NS/GunTech/CheatSheet.aspx?p=0&t=1&i=572
Hope all this info is of use to you and not tooo tedious. Best Regards, Kevin Mayes.