The sunroof is too small for the Zumo 660. If the side parts pulled out until it clicks, then the hole is too small. Wicked Chili Universal sunroof sunshade for Navigon 92, 72, 42, 70, 40, 20 (Plus / Premium / Easy / Live series) 2510 Explorer 4350 max 1410 2410 7210 7310 4310 max 3310 max 1310 6310 6350 live 4350max 3310max 4310max 8410 8450 GPS ...