Omega 2846-2848 gasket and crystal

I’d like to replace the gasket and the crystal. The gasket looks like about 31.5mm OD or so. I think the crystal is PX5140 (the watch is gold color) but can I just replace the crystal without replacing the tension ring? I’m a newbie (obviously) and saw some videos with a grabber tool that compressed the crystal to remove it and vice versa. I am asking for some assistance on where to buy the gasket and crystal. Thanks.

As a noob, you should probably be asking for a good watchmaker near you.

Probably right. In any event, hoping to get some info. Thanks.

You usually need a press and some experience with it, be comfortable removing the movement in/out safely, have storage solutions etc. (sometimes just transparent kitchenware)

I don't know about this model specifically, but I press onto the armor ring with a nylon die from under the case, this way the crystal isn't stressed

Armor ring is also an important cosmetic detail, contributes a lot to the good looks, often it goes bad before the crystal does - I didn't really appreciate this until very recently, but I do like matching an armor ring patina to a dial patina/age, so you might be onto something