I have taken measurements of the replica mic. It is 3.90 inches in length by 2.17 inches in width.
Seems to be pretty close to the dimensions Shure give for theirs according to this diagram.
It's still in the box, I have been somewhat distracted with house renovations, and having a baby!
Still pretty confident that the mike will fit just fine. If you can wait a couple of days I may be able to borrow some calipers and more accurately measure.
This may be of interest to anyone looking for a cheaper alternative to a vintage shure 55sh mic
Ive just received a replica mic body from aliexpress. it's looking like being pretty bang on for size.
Was only $30.39 + $7 shipping
Pretty good deal In my humble opinion.
I have yet to cut into it...
this may do
https://www.amazon.com/Hobart-770580-Shield-Replacement-Shaded/dp/B002VECKRO/ref=sr_1_1?s=automotive&ie=UTF8&qid=1486853132&sr=1-1&keywords=Face+Shield+replacement++tinted