If this has not been posted before....perhaps a moderator could sticky this. The links below offers an invaluable source of parts for a huge range of synths etc. Now you dont have to worry so much about sourcing 'rare' parts.
http://www.vintageplanet.nl/ (New Old Stock parts. Huge catelog. All the main manufacturers)
http://www.technologytransplant.com/ (Brand New Stock parts. Custom built replacements + Cloning PCB's and Components)
http://www.synthparts.com/ (Vintage synth chips including CEM, SSM, Roland IRxxxx, Yamaha IGxxxxx. Pots and Sliders. Knobs and Slider Caps. Keys, Switches and Jacks. Email to inquire about other parts)
http://stores.ebay.co.uk/North-Music-Ltd (Synthesizer repairs & supplier of vintage spares and musical equipment: Roland, Boss, Korg, Yamaha, Kawai, Sequential Circuits and Casio)
http://www.route66studios.com/ (Brand New Replacement Floppy Drives and synth parts/batteries - Akai Samplers, Emu Emulators, Emax, SP1200 etc, Yamaha DX7MKFD, Ensoniq SQ80, Mirage, Korg DSS1, 01/Wfd, T1, T2, T3 etc etc)
http://www.synthrestore.co.uk/ (Email Adrian for help with servicing/restoring analog and digital synths + sourcing parts)
http://www.synthrepairservices.com/ (Email James for help with servicing/restoring analog and digital synths + sourcing parts)
http://www.rlmusic.co.uk/service_01.html (Contact Richard or Kent Spong for help with servicing/restoring analog and digital synths)
DS