click
www.citroen-ca.com (buyer's guide) for a start
Wikipedia gives a bit of history and overview
Possible lead for parts source in USA:
www.shopcitroen.com (San Diego)
The last one came into the USA in 1973, as the French by then were feuding with the U.S. DOT about bumper heights, and the issue never got resolved.
Those SM cars are truly unique and beautiful. I love looking at them.
"Some French cars 'ave front wheel drive - and some 'avant"
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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd
Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive

(sold)