Please refer to http://pro.grohe.com/  prevails for all spare parts matching information. Bellowed are for reference only. 

Grohe 38691 Eau2 Old style Dual flush dual air hose
Grohe 37945SH0 Adagio 6L Cistern bottom feed 37945
Grohe 38690 dual flush cistern
Grohe 38691 Eau2 cistern AV1
Grohe 38661 GD2 WC concealed toilet cistern
Grohe 37175 mechanical actuation cistern
Grohe 37050 mechanical cistern
Grohe 38948 Rapid SL 2 in1 wc frame set
Grohe 38721001 Rapid SL 3 in 1 wc frame set
Grohe 38525001 Rapid SL WC 6-9l Cistern 38525
Grohe 38528 Rapid SL WC Cistern
Grohe 43907 Villeroy and Boch Amadeus
Grohe 38422 WC concealed cistern