After further investigation it appears that the 504 is also available in another part of the African continent.
Here's a link to the web site for Peugeot Kenya.
http://www.peugeot.co.ke/default.htm
They have some information about the 504 there, which is sold in saloon estate, and pick up versions.
On the specification list they have included a long range fuel tank, and heavy duty suspension, which is not surprising given the conditions on some of the roads there.
This model probably manages better than the more "modern" models on offer, and probably still uses the earlier diesel engine, as an HDI would make the car more complicated, and difficult to fix if, it has problems miles from a main dealer, and their lap top.
It appears that they still sell it with the old style look, 8) and have not fitted the car with different lights unlike Peugeot Nigeria.
Also, because of its reputation it's known as "King Of The African Road," by the Kenyans. 8)