Not that it really matters I suppose...but since you seem curious as to what year your X is....
If this pic you posted is of your X:
View attachment 83397
then look carefully at the ends of the bumper tubes. That tells me your X is a '75-'78 chassis !! note the shape of the ends of the tubes. That looks stock and un-modified, and a '75-'78 style. I believe - could be wrong - that from '79 on fiat changed the ends of the tubes to incorporate a towing eye. Look at the pic below of my '81:
View attachment 83399
note the totally different shape....with rolled edges on mine.
Here is a pic of a '75. Crummy pic but note the same end shapes as yours:
View attachment 83400
Also note...on the pic of your X.....those upper mounting tabs for the grill...they look original....are the '75-'78 type. The tabs on a '79 and up are totally different.
This all tells me your chassis is a '75-'78. There are other ways to tell - or narrow down the year...if you want....