As MMAjunkie.com first reported earlier today, the event takes place Nov. 5 at the 16,000-seat LG Arena at the National Exhibition Centre in Birmingham, England.
UFC officials since have confirmed the event details and main event, which airs via same-day delay on the UFC's longtime cable partner.
With the addition, the UFC's Nov. 19 event (which is headlined by heavyweight champ Cain Velasquez vs. Junior Dos Santos) will be UFC 139, rather than UFC 138.
The Nov. 5 event, initially believed to be UFC Fight Night 25, instead will be a traditionally numbered UFC show. The UFC hasn't host a show in the U.K. since October 2010. The event, UFC 120, took place in London and aired via same-day delay on Spike TV.
Leben looks to build off a 27-second knockout of Wanderlei Silva earlier this month at UFC 132. It was the longtime UFC fighter's fourth win in five fights, which also included victories over Yoshihiro Akiyama and Aaron Simpson. The lone defeat came to Brian Stann.
Munoz, meanwhile, has moved into title contention on the strength of a three-fight win streak and six victories in his past seven fights. His current run includes decision victories over Simpson and Demaian Maia and a knockout of C.B. Dollaway.
The matchup pits striker vs. ground fighter with Leben (who owns 14 career knockouts) and Munoz (an NCAA Division I national wrestling champion). In recent fights, though, Munoz has become much more comfortable on his feet.
To date, the UFC has hosted just one show in Birmingham. UFC 89, which took place at National Indoor Arena in October 2008, drew 9,515 attendees and featured a headliner between Michael Bisping and Leben. The tape-delayed Spike TV broadcast peaked with 3.4 million viewers and averaged 2.6 million.