Sebastian de Avila & Lugarda Dias de Leon / Nicolas de Avila & Gertrudis Falcon de la Garza of Pinos, Zacatecas

I have reviewed a dispensation that identifies Sebastian de Avila as the son of Nicolas de Avila (and with further research, Sebastian's mother was Gertrudis Falcon de la Garza). Sebastian's wife is most commonly known as Lugarda (or Josefa Lugarda) Dias de Leon (or sometimes her last name is Becerra).

I am trying to locate the marriage records for Sebastian and Lugarda and Nicolas and Gertrudis. Sebastian and Lugarda had children born in Ojuelos and Pinos (the children were born between 1771-1791), but the marriage records in Ojuelos don't reach as far back as 1770/1771 as far as I can tell. Is there another city where those records could be kept?

Nicolas and Gertrudis had children in Pinos and San Felipe, Guanajuato; the oldest child I have found so far was baptized in 1727 in Pinos. I have not located a marriage record for Nicolas and Gertrudis, yet, but I'm hoping someone on NR has encountered it in Pinos or elsewhere. Nicolas is noted as the brother of Bernardo de Avila, who in turn is the son of Juan Lopez de Avila and Juana de Trujillo.

Any help would be appreciated,

Rosalinda