I have an old Craft Diston shower enclosure in my master bathroom... the handle broke and there are no replacements. So I bought a generic outer handle at Lowes. But they didn't sell anything that also had an inner handle. So I made this thing.

This handle goes on the inside of the enclosure and the screws pass through the door into the blind female holes in the outer handle. The screw holes are spaced 74mm apart to match the outer handle from Lowes. I had to drill a new hole in my enclosure since the spacing was different from OEM. But it works great.

3 tricks:

(1) use stainless or brass screws and cut them to length with a Dremel cut off wheel or such if necessary. My Lowes handle took 8-32 screws.

(2) use a little HVAC silver tape to cover any extra holes in the enclosure.

(3) you may need to trim the door or the magnet just a tad to get the tabs of this new handle to fit flush. A Dremel also works for that.

Update: I have managed to break this again, so I tweaked the design to strengthen it where it broke, at the screw tabs.