All Wald bars are 25.4mm, or 1 inch, so that's one of the missing measurements. You still need to make sure that it fits with the stem, which could be either 25.4, 26 or (it's unlikely but possible) 31.8mm.

It's a non-trivial endeavor, and unless you are looking for an expensive learning experience, I might suggest leaving it to the professionals.

As far as Wald handlebars, while they may not cost much, they are very well made and durable as all get out. There is nothing wrong with them. Well they are heavy, but I have the feeling that doesn't matter too much to you.