MS did use Marinco wipers.I searched every auto parts store in my area and never found any that worked. I ended up buying them at WM. A little more $$, but they fit. I think they are marincos. Here's a link:
https://www.westmarine.com/buy/marinco--deluxe-ss-wiper-blades--P019638816?recordNum=3
MS did use Marinco wipers.
Various ones are shown in the MS, Luhrs, Hunter part photos linked in the Marlow-MS section sticky re parts.