in 20mm i only know EWM, they produce an Indian ( mostly used after Dunkirk ) , a Terrot and a G&R side cars, and a Peugeot solo motorcycle .
Most of the Fusiliers Motocyclistes units ( GRDI-GRCA, Recce regiments ( in fact Armoured cars Regiments ) of the Cavalry Divisions ) and motorcycle squadrons of the dragons portés régiments ) were issued side cars, so you can use the Terrot or the G&R AX2 . After Dunkirk, the Indian side car was used to recreate units who had lost their vehicles .