Bobtail mainspring housings

I was surfing around trying to catch a deal on a bobtail mainspring housing. I found the Ed brown housings on midway, but I found this housing made by fusion firearms http://www.fusionfirearms.com/servlet/the-574/BOBTAIL--Style-dsh--Mainspring/Detail

Is this going to give me the same shape as the EB part? Would I use the same jig to locate the pin hole?

Also does anyone have a source for the kimber housings? I'm sure they are made by kimber, and they are shaped differently. But can they be had?

Thanks Highroaders