That model will accommodate a T12.  My fixture actually states "use only F15T12" on the label though of course a T8 will work just as well.

@Patrick, this is good to know... especially since I haven't really tried my cold temp ballasts with T12s, long term. I may end up using T12s after all.

I'm back to revive this thread again... there is a possibility that I may be purchasing LED light tables, for use in my upstairs loft.
I of course plan on taking those LED strip lights out and replacing them with fluorescent T12's. Right now, two F15T12 strip fixtures that
can fit HPF Trigger Start ballasts, look to be the best bet... or F14T12 fixtures, same. I'd be using two of my HPF Trigger Start ballasts,
one in each fixture. This idea would be the final lighting addition to my recently completed lighting project in my living room, for the
upstairs loft only though -- no light tables will be used downstairs.
Although undercabinet fixtures might actually work in this case as well, I'm primarily focused on trying to find two F14T12 or F15T12 strip
fixtures that can fit the HPF single lamp Trigger Start ballasts.