I'm "the friend" that Nick posted this question for, so thanks very much for everyone's input (and thanks Nick for posting it). According to the Charles Lindberg site that was suggested:
"The two tubes beneath the fuselage are flare dispensers that were installed for Lindbergh's flights to Latin America and the Caribbean."
That seems to make more sense to me than the fuel dump tube suggestion, mostly because of their position on the fuselage (aft of the cockpit by several feet), the diameter of the tubes (at least 2-4" wide), and the fact that they just look like they were some kind of later addition (some fairly rough patching is in evidence around the tubes).
Since I am doing the S of St. L as it landed at Paris, I'll leave the tubes off.
Thanks again for the assistance.
Tim Burke
#33715