Pac-Fab pool light

Hi,

I’ve got an old Pac-Fab model 60-xx5x, 500W, 120V,R40 - I need to replace the bulb.

I’ve seen discussions regarding this model, but I wanted to ask a couple of questions:

Is this the Hatteras version? When you replace a bulb, do you always have to replace the gasket?

What are my most economical options for bulb/gasket replacement?

I have attached a picture for reference. Thanks!