If it's just a 1/4" rip, can't you repair it without any additional material? Perhaps you could sew it shut, or use a bit of seam seal material to bond it shut.
FWIW, some of the thermarest repair kits come with bits of material in a huge range of colors. You might be able to find something close and use that.
Alternatively, can you snip a little scrap of fabric off of your tent elsewhere? Perhaps there is a little bit extra seam allowance somewhere? Or an unneeded hang loop?
In general, I've had pretty good customer experiences with GoLite. The only small exception has been a current small issue where I bought some shirts using the 40% off National Trails Day coupon. They ended up being too small. I wanted to get some larger replacement shirts in the mail ASAP, so I asked if they could sell me the correct size using the now expired coupon and I would return these ones. They said no, so I had to mail in my shirts for an exchange. Kinda sucks because I'm in Canada so that means an additional few weeks of waiting while these shirts are in the mail back to them. All of this could have been avoided if the measurements of the shirt where as GoLite claimed.