I think its a little steep myself but it depends on what your looking for. I have a set out of my 68 fastback that do not have a tear in them. Yet, I took them to the ford swap meet in columbus last spring and did not get the first offer when I had $75 a piece on them.
Off course the covers have been replaced and are not orignal but they do look nice.
I replaced them with a set I bought that came out of an 89' convertible
stang with the knee bolster for $175 including the back seat (which i have no use for)
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'66 Ragtop, vibrant red, 289-4V, 4-speed toploader
'68 Fastback, space blue metalic, 351C-4-V, 4-speed toploader