There IS in fact a manual on the W 113 (only they call it the R 113 - why?):
280 SE/ C, 280 SE/ C 3.5 (W111), 280 SL (R113), 280 S/ SE/ SEL (W108), 300 SEL/ 109.016, 300 SEL 3.5, 6.3 (W109)
$108.99
Cees Klumper in Amsterdam
'69 white 280 SL automatic