まとめ

FMラジオ用のハウジング
http://www.banggood.com/DSP-PLL-Digital-Stereo-FM-Radio-Receiver-Module-87-108MHz-With-Serial-Control-p-1004778.html

スイッチ
http://www.ebay.de/itm/20tlg-Micro-Schiebeschalter-0-3A-kleiner-SPDT-Schalter-mikrotaster-Slide-Switch-/351325819602?hash=item51cca692d2:g:3rMAAOSweW5U7Z-U

アンテナ
http://www.ebay.de/itm/Replacement-41-5cm-6-Sections-Telescopic-Antenna-Aerial-for-Car-Phone-Radio-TV-/311498107047?hash=item4886bbe8a7:g:pJ4AAOSwepJXUSSp
またはそれに似たもの。