Xpelair GX6 Shutter Assembly (Pre-1994) (41042SK)

Xpelair 6 inch extractor fan shutter assy (GX6, RX6), fits very old type (pre 1994) Xpelair fan models, please advise Xpelair product number of fan when ordering to be certain of correct part.  This is primarily a window model Xpelair extractor fan but could be converted to fit in a wall by using ladder strips. G is for glass, W means only wall fixing model, C has a pull cord operated switch.