151 mm sitbones are going to be too wide for a 155 mm Jett.

What about a Selle An-Atomica? Or, if you can tolerate a lot of padding, "recreational" or hybrid-type saddles tend to be wider (since the sitbones are spaced wider in an upright riding position).

Alternately - rather than even bothering to measure - try my method of circling your sitbone-print on a piece of paper that you can bring saddle-shopping with you. It's a lot easier to see where you might be sitting on any particular saddle and whether the slope will let it support you or not.