Leightons is known for their high-quality seats, but they have lost their metal fabricating source and are unable to supply complete seats for some models. I've had their 650SS seat on order for four years now, but despite encouraging rumblings every once in a while, they are not able to provide an ETA for it.
Spyder Integrated Technologies
Lucas & BTH Magneto Restoration
Lucas & Miller Dynamo Restoration
SMITHS Chronometric & Magnetic Instrument Restoration[email protected]