Cabriolet rear window staples.

I'm trying to find out what size staples I need to fix a vinyl roof to the window frame, looking at stainless steel staples.
Any recommendations to a staple gun as well, not looking for an expensive one as I would only use it for this job and then maybe again in 7 to 10'years when the roof needs replacing again.

ebay link etc would be good. 

3/8" is what I use, a good stapler is pneumatic, a Hand Held would be a sure shot, or t-50.

You will probably need a large punch or steel block and a hammer to set the staples as you don't want no snaggies.