replacing stock mast plate with Garhauer block mountable mast plate

[hockeyfool]

  I just noticed on the garhauer website several models of mast step plates that add raised wings on port/starboard and forward
of the stock plate.
So that extra metal has 12 or so  1/2" pre-drilled holes for attaching blocks , saving
the cabin deck from  having more hardware mounted .
Any idea of the hole spacing or original size of stock mast plate ?View my cart of Garhauer Marine Hardware
Click on the picture to see enlarged version.

MS-1 - Other    Mast Plates
MS-1
length:    5-1/2    width:    3-3/4
weight:    20 OZ    shackle:    
All dimensions for mast plates are measurements of the flat surface of the plate making direct contact with deck.

$31.63
MS-2 - Other    Mast Plates
MS-2
length:    5-3/4    width:    4-3/4
weight:    20 oz    shackle:    
All dimensions for mast plates are measurements of the flat surface of the plate making direct contact with deck.

$32.78
MS-3 - Other    Mast Plates
MS-3
length:    7    width:    4
weight:    19 oz    shackle:    
All dimensions for mast plates are measurements of the flat surface of the plate making direct contact with deck.

$33.93
MS-4 - Other    Mast Plates
MS-4
length:    9-1/2    width:    6-1/8
weight:    36 oz    shackle:    
All dimensions for mast plates are measurements of the flat surface of the plate making direct contact with deck.

$40.25
MS-5 - Other    Mast Plates
MS-5
length:    10-3/8    width:    7-3/8
weight:    40 oz    shackle:    
All dimensions for mast plates are measurements of the flat surface of the plate making direct contact with deck.

$45.43
MS-6 - Other