Hood hat for WD-58H

I am planning to buy at B&H wide angle adapter WD-58H along with hood hat from OP/Tech USA:

http://www.optechusa.com/product/detail/?PRODUCT_ID=16


As this item has no front thread, i'd like to know the front side diameter of it's petal hood so i could to choose which one of op/tech hood hat to buy along with it.

Neither Canon support nor OP/Tech and B&H couldn't provide me with this info.

here is OP/Tech reply:
It has been too difficult to keep track of all the different size shades
and adapters. The easiest way to size a Hood hat is by measuring the
diameter of the item you wish to cover. If the adapter is oval in
shape, use a dimension that is half way between the largest and smallest
dimension across the oval shape. The neoprene covers stretch to create
a custom fit.

http://www.optechusa.com/product/detail/?PRODUCT_ID=16&PRODUCT_SUB_ID=&C
ATEGORY_ID=6
The Hood hats will fit items from 2.75 inches to 7 inches.

I hope this helps.

Terry Jackson
OP/TECH USA
304 Andrea Drive
Belgrade, MT 59714
406-388-1377


and Canon' one:

[SIZE=1]Thank you for your inquiry. We value you as a Canon customer and
appreciate the opportunity to assist you.

We are sorry to inform you that Canon has not published the lens hood
diameter. We regret any inconvenience.

Please let us know if we can be of any further assistance.

Thank you for choosing Canon.

Sincerely,

Chris
Technical Support Representative


So, dear owners of the WD-58H, could you measure it's petal hood front size (WxH) please to clarify this issue. Somebody help me pls.

Thanks in advance.