Greetings Dan, did you ever find your .380 Parts?
There is no pin in any of the M1907 sears. The small hole in the breechbolt behind the sear houses a sear spring, sear rotates on its small 'arm'.
Your pistol must be M1907-13-Mod 2 or higher as you specifically said 'new style' sear. I assume a Type 3, as The Type 3 fits .380 M1907-13-Mods 2 through 4, M1907-19 and M1907-20 variants.
I am pretty sure I have all the parts you need.
I even have a few spare cartridge indicators but do not sell them, reserving them for critical restorations. Be careful trying to make one unless you absolutely only use it for display. I and my brother have been down the road of trying to fabricate them by hand and quotes from commercial sources. Firing one with a hand-made one with no tempering is 'exciting' if it deflects with return to battery and catches the slide ... I suspect that is the reason so many were broken. Can be done, but due to fabrication setup, minimal unit runs, tempering etc, no one would buy them when the unit price will exceed a nice pistol.
I am not too frequent on here but trying to do better You can contact me directly at Savage1907
aol.com.
Best,
Also DK