hubieran provisto
-they/you had provided
Past perfect subjunctiveellos/ellas/ustedesconjugation ofproveer.

proveer

Se incluye además una pieza vacuformada que tiene las cubiertas de las luces delanteras en una delgada pieza de acetato con el deflector de viento del conductor impreso encima (aunque yo hubiera querido que hubieran provisto una plantilla en el manual de instrucciones).
A vac formed piece is included that has the headlight covers on and a thin piece of acetate with the drivers wind deflector printed on, (although I would have preferred it if a template was provided for it on the instruction sheet.
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to drizzle