Weaver mount - need assistance

[Shellwaster]

If anyone has the weaver multi-slotted base for an 870 would you mind measuring the distance between the screw holes for me? 

I'm looking for a multi-slotted one piece mount with the screw holes that are 1-1/4" apart. I've had one made but can't quite get it milled down low enough to my liking. This is for a custom application and not for an 870.

Thanks.