See if you have part available.
Thanks


The 39-382 may have a similar arm, but the base is a very different design and would require more extensive retrofitting of the sill to even install. That's also assuming it even works after that, which isn't a guarantee. Matching the arm is important, but it's usually easier to work around that than a totally different style base.
To be clear, both operators are going to require extensive retrofits to even have a hope of working. In my estimation, the 39-264 would probably require the least amount of work between the two, but I really don't think either one is going to work. The design in both cases is far, far too different.