Need help finding scope base.

[Pete112288]

So my dad got a new scope for his rifle and when I went to mount it for him I have come to an issue. The new scope he got is a 34mm tube, and be bought new rings for it. His old scope was a 40+ year old bushnell with weaver rings.
The new rings need a bigger cross slot in the base. It needs the size slot like picatinny rails have, not weaver style.
The bases on the rifle were 2 #11 weavers.
The rifle is an old 1917 Enfield 30-06 that had no original base mount holes and was drilled and tapped later. So I am having an extremely difficult time finding a new base to go with his new scope and rings.
The hole spacing is 2 holes in front and 2 in rear, they are .504 or so apart, allowing 2 piece weaver #11s. The hole spacing between the rear hole in the front and front hole in the rear is 4.20"
I can't seem to find anything that matches up that will give a larger cross slot.
Please, any help is a giant help.

[GWP]

I have just taken a round file and opened up the cross slot. The slot does not really do anything but provide a spot for the screw to pass through.
If, that is, I am understanding your issue correctly.

[EnglishSetter]

Might check with Warne.

I think you can even get blanks and make your own holes.

Geometry and elevations where it meets the receiver would be key.

The cross slot does take recoil. 

[chukarchaser]

Give Talley a call

[Parasite]

Remove the bases and have the cross slots milled to Picatinny specs.

[jrebel]

This guy will get you lined out.  His products are second to none. 

https://www.murphyprecision.com/custom-services/

[Karl Blanchard]

Remington model 7 uses weaver #11 for the front. Could scrounge up a few of those but honestly it's probably easier to return his rings and just buy weaver compatible rings.