Need to know sight blade height please

[www]

I have a 4 inch 29-3 that needs the rear sight blade replaced. I'm not sure what the factory blade height is. Can someone help?
Also should I decide to go with a Millet blade will the height be the same?
Thanks

 

[robertrwalsh]

the one on my 6 1/2 " is about 0.090 overall height.

 

[H Richard]

Call S&W to order one and give them what barrel length you have. They will tell you what one you should have.