Carpentry and Woodworking - Door Jamb

I have a newer hollow type bathroom door.

The door jamb, lock side, is damaged and needs to be replaced. It measures 4 3/4 wide. However the only replacements I see at the big box stores are 4 9/16, which obviously leaves a big gap.

I considered just cutting what I need with the table saw, but the edges seem so perfectly square as opposed to the edges of the existing jamb which have a subtle radius.

Since I don't have the skill or knowledge to replace this door or create this radius, can anyone give me other options to replace the jamb?

Why not purchase a split jamb, which will fit the opening you have perfectly every time.

Not sure how you could get that one piece out without tearing up the whole frame. However if you think you can, you could copy that curve somewhat with a belt sander or even a hand sanding block. Might be easier to replace the whole door. A prehung split jam, like I think Chandler was talking about, is fairly easy to install.

Thanks for the replies. Please describe a split jamb--how it works and where I find one.

A split jamb door is just a prehung door with 2 halves. The casement is already installed on the edges. basically you take the half with the door in it. Set it in the frame and set your reveal until the door swings freely and evenly and nail it up. Then the other half slides into the grove of the first one and you nail it too. They sell them at any big box store. If you saw one, the way it works would seem obvious. You could Google specific installation instructions or ask the salesman any questions you might have at Home Depot or whatever. I like to nail the hinge side in first if there is room then move and shim the other 2 sides as necessary

I finished the job, and actually it was a 4 9/16 jamb. I did get the old one out. Getting the side jamb out without destroying the top one, as they are nailed together in the corner, wasn't easy. --I had to cut them with a sawzall just so.
Then I replaced the jamb and the trim.

I am usually pretty critical of my own work, but the end result turned out great.
Thanks for all the replies.