Does this help you?I think you have made the same search as me....
...and I couldnt find any cross sectional diagrams of a Flanbloc either. Plenty of other types of 'flexible' bushings.
Trade name, right...? Is it intellectual property or that they just dont get used widely..? Either way, I'd like to see one cut one in half....
すべりブッシュ: Sliding Bushing
ピロボールブッシュ: Pillow Ball Bushing
ナイロン: Nylon
ダストシール: Dust Seal
テフロンキャンバス: Teflon Canvas
ラバー: Rubber
These bushings are used in the last Mazda RX-7 (FD). They are not used widely because of the cost, in my opinion.