Tsunami / Sceptre helm seat question

[abl1111]

I threw out the original helm seats on my 1975 23' Tsunami and really would appreciate if anyone has them still - to pls provide the overall width of the seat.

I am looking at a nice pair of Pompanette's, but they might be too wide for the boat. The arms are about 27" wide, - side to side !

Thx...