SLX seatpost size?

I have an 80's Benotto SLX frame

From what I can tell most SLX frames from different manufacturers seem to have a 27.2mm seatpost

I was told my frame was also 27.2mm, but the post seems a little tight

Are SLX frames all the same diameter seatpost wise?

some of us ned to see PICTURES.... comon, don't hold out on me man. An SLX Benotto is what i need... comon!

PS my benotto (not SLX) is 26.6 but you're probably right. take it to a shop!