I have a 1976 and a 1977 SolCat 15...
the 76 has a front cross bar and the tiller is behind the blocks.
On the 77 the tiller is in front of the blocks and no front cross bar...but has cool ice chests in each hull.
All the Solcat 18s I have are without a front cross bar...not sure what year my oldest 18 is...I think 1975