Can anyone advise me on the replacement of snap fasteners on my canopy?

The canopy fastens with flat snap fasteners around the top edge of my windscreen, unfortunately the screws holding the male side on to the aluminium frame have elongated the holes. I have tried to get new screws large enough to take up the slack, however the heads are too big to fit inside the "cup" and the male/female won't snap shut.

Has any one seen/used these:
http://www.chandleryworld.co.uk/acatalog/info_266CPY000016.html
And would they fit a Taylormade screen?? I'd prefer not to bore new holes around my window frame or put additional holes in my canvas...Any advice appreciated.

Thanks in advance,

Clyde