MMC have fitted both Sachs and Bilstein shock absorbers at different times , BUT it would be most unusual for them to fit 2 different sets on the same car (although nothing is impossible at Malvern of course!)
The Bilstein is probably the better quality product so if you want to save some pennies and buy 2, I would replace the Sachs. As Doug has said shocks should last years , especially with the limited suspension travel of a trad Morgan, but many have found handling improvements by specifying higher quality , or adjustable times.
Not at all unusual Andy, my 2008 4 seat had Sachs on the front and Bilsteins on the rear, so did Geoff Trigwells 2007 car.
I am amazed they didn’t mix brands side to side!
BR
Colin
