Cuquio Records

Any ideas on how to access church records that aren't posted on
familysearch? I need matrimonial records for Cuquio, Jalisco that predate
1741, which is the earliest posted. I emailed the archdiocese and they
referred me back to Cuquio. There are baptisms posted prior to 1741.

I believe my ancestors, Diego Ruiz and Catarina Perez, were married there
in the early 1730s. I have found them listed as padrinos there in 1736 and
several children born there, starting in 1737. Unfortunately, so far, no
grandparents nor origens are noted. There are not a lot of Ruizes at this
period, so I don't think there is much of an extended family based there
(there are lots later on), so I'm guessing that within a generation back
they will elsewhere. Diego died between Dec 1785 and Dec 1789. Catarina
died after Dec 1789. Their children I've found so far are: Maria Luisa,
24 Aug 1737, Joseph Anastacio c1739, Joseph Joachin Maria and Joseph Miguel
Maria, 23 Nov 1745, Manuela 1749, Maria de la Candelaria, 24 Jul 1760, and
Manuel.

Any ideas or leads would be much appreciated.