Spanish to English Bus/Financial Law: Contract(s) contract of credit facility

I am translating a Mexican/Castilian document to British English in which there is a list of terms (usually one or two words, no space for a long explanation), and "avalista","fiador" and "garante" appear. They also appear in the text of the document. Normally I would translate both of them as "Guarantor", but when all three appear?

Here is an example (taken from an extremely long sentence):
...a que los activos de la Acreditada o cualesquiera Garantes (distintos del Fiador) sean usados primeramente como pago de las Obligaciones Garantizadas y cada Fiador expresamente renuncia a los beneficios de orden, ....

or
Además cada Fiador conviene en que el Agente Administrativo puede otorgar prórrogas, liberaciones, o reducciones a la Acreditada o los Garantes (distintos del Fiador) sin necesidad de su consentimiento,

In most places of the text, when it mentions "Fiador" it says "Obligados Solidarios y los Fiadores"

As for avalista: here's an example from the text:
los Pagarés que documenten las Disposiciones contenidas en las Solicitudes de Disposición correspondientes, debidamente suscritos por la Acreditada como deudor y los Garantes como avalistas

In the heading of the document it lists two companies by name as the Garantes, but later in an appendix it lists the same two companies as avalistas.

So, having different words in English to refer to these different persons would be a great help: Garante, Fiador y Avalista.

Thanks so much!!!!