What is the serial number of your pistol?

Don't know of a repro maker or replacement.

Here is a sketch and approximate dimensions;

[Linked Image from i.imgur.com]

McMaster Carr has many kinds of rod stock.
I'd go with 3/32" dia, experiment to get the radius/arc correct, cut to length and turn right angles.
Don't know whether to use "soft" steel to form, then harden & blue?? or just form & blue.
May take a couple of tries but should get you close.

"Every day above ground is a good day."