New (NOS) Estafette wiper motor for sale. SEV, part number 7701349153. 12v. Will also fit pre-82 4s fitted with this type of motor (rather than the silver one with holes in the casing). The wiring is different on 83> models.
I'm afraid I don't know much about Estafettes, but this is the only wiper motor listed for them in my 1994 parts book. The same motor was used in R4s from 1971 to 1982 - it replaced the older SEV type with a perforated metal cover (see photo below); there's a good chance it was the only motor Renault issued as a replacement part in subsequent years. Which type does your vehicle have?