In 61 and 62 the Laurentian was available as a 2 door sedan or 2 door ht. I have seen both.
I'm not as familiar with the 55-60 models but I believe the Laurentian was available in the same 2 door configurations as 61-2.
From 63-68 the two door sedan was the only option. And as many here know, in 69 and 70 the Laurentian and Strato Chief 2 doors were available only as hardtops.