They look the right ones to me (but looks can be deceptive
). As far as I know the front struts on the 131s were all the same shape and size although there were several different part numbers from Fiat; the 131 Sport/racing certainly had a different part number for the front struts but 'ordinary' 131 struts will fit. I suspect the years of 75-78 are given because these are from the USA for the American Bravas and there was probably a model change and therefore a part number change in 1978.
I too have Konis on my car and also have a spare set so I can probably check for part numbers but not before the weekend. My Konis are yellow though so I don't know if there was some colour coding for these shock absorbers that would give them different part numbers.
Since your car has been modified to accept different shocks, you'll probably find that the originals will no longer fit straight on. I would say you should go for these on ebay as you haven't got long to ponder about it and hopefully they'll fit straight on. Worse case is that you'll have to sell them back on ebay but that's a very good price for Konis so I doubt you'll have trouble getting your money back.