If the '66 Electra mounts are the same as '66 Wildcat mounts they are not available anywhere as far as I know. 1966, one year ONLY. They can be re-vulcanized at various company's. I think that '61-'65 mounts are physically the same construction except they are not as heavy duty. On my '64 Riv. I used to break mounts on a weekly basis. What I did is add 4 links of chain. Welded the chain together & left the center loose, about 1/4" so vibration would be less likely transmitted into the car. I used a heavy flat washer with a bolt about a 1/4" or so longer on each end of the chain. I attached one end of the chain to the upper front motor mount hole & the other end to the middle of the mount underneath. I then painted it black so it would be less visible. Haven't broken a mount in 30+ years.
Tom
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