the peugeot is a bit skinnier than the AX-15, but they are the same overall length.
When you crawl under neath, does the trans have a series of bolts in a row running front to back? The Peugeot's case splits into a left and right half and has bolts along the bottom and top. The AX-15's case has a front half and a rear half, joined together at a 1" thick ring of aluminum.
you can see the thick ring on the AX-15 here
And you can see the seem of the Peugeot circled here. Note that the AX-15 has no such front-to-back seam.