Here is info from autozone website.
www.autozone.com I don't know if you can bolt it up to the flex pipe or not but I am goign to find out.
EXHAUST SYSTEM for a
1996 MERCURY MYSTIQUE
ARVIN
EXTENSION PIPE 359765 LLT $34.99
ARVIN
MUFFLER-O.E. 103128 LLT $79.99
ARVIN
RESONATOR ASSEMBLY 241170 LLT $35.99
ARVIN
SUPER C MUFFLER 151262 $34.99