I've heard a lot of bad stories about the newer "improved" coils. My 1958 TR3A with 194,000 miles since I bought it brand new still has the original coil. A few years ago, I was in London and went to the car museum in Enfield just south of the M25 and they had a garage full of "auto jumble" type items. For ÂŁ5.00 cash, I bought a used coil exactly like mine - just to have it as a spare. When I got back to Montreal, I swapped it with my original one and it tested OK. I put back the original coil and now I carry this "old" coil as my reliable spare.