I wanted a 20-40lb seat as well for my grandson. Dealer said only the sub 20 lb seats were available. I figure in 3 months he would be out of the smaller seat, so I guess it is an aftermarket seat for the back of the old 300E.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E