The 'Pagoda' SL was replaced by the 350 SL (R107) and 500 SLC (C107) in 1971. There were two lines to this range, the R107 recognisably a successor to the SL roadsters and the new C107 a kind of extended SL in 4-seater coupe form thar replaced much older 'fintail' coupes. Launched in 1971 as the 350 SL and the 350 SLC, these cars used a 3499cc V8 engine, except for the American market where a 4520cc V8 was fitted. In 1974 Mercedes responded to the fuel crisis by announcing the 280SL/SLC with a 6-cylinder 2746cc fuel-injected engine that was surprisingly sporty and only took one second longer to reach 100Kmh than the 450. In 1980 the range was rationalised to the 280 and new 380 and 500 models of both SL and SLC, and all the SLC models were replaced in 1981 by the new W126 SEC coupes. In 1985 the 280 SL was upgraded to the 300 SL, the 380 SL to the 420 SL, and the 500 SL to the 560 SL with corresponding increases in engine sizes. In 1989 the new R129 SL 280 and variants replaced the final R107 SL models.