Measurements as below
Inner 52.8
Outer 57.3
Slots are
6.00 approx as they not all the same
by 14.8 BUT they are rounded at the bottom
from Keypart website it is suitable for these. does not look like it will fit yours
DP-H
DPH-BP
DPH-A
DPH-B
DPH-C
DPH-D
DPH-D1
DP-H
DPH-BP
DPH-A
DPH-B
DPH-C
DPH-D
DPH-D1
DPH-E
DPH-E
DPI-A
DPI-A