I've seen no cloth top option for V6
I purchased a red candy metallic 2011 V6 premium convertible with the Pony package. There were no options for cloth or the performance package (though even for coupes the performance package isn't available until August) that I could find.
I believe you purchased the car in Canada...perhaps Ford offers the cloth top through Canadian dealers? Down here in the 48 it's vinyl only for the V6. A very high quality vinyl top, for that matter.
To the original poster...don't fret too much over the vinyl top. It's high quality, durable and looks expensive. It's also very well made, thick and double lined. Seals well and does an excellent job (for a vert) of keeping the outside world at bay when the top is up.
Convertibles already come standard with the strut tower brace, btw.
Hope you find the Mustang you love.
2011 V6 Premium Convertible. Pony Package, 6AT, Red Candy Metallic, Black Top, Stone Leather.