I means retractable in the canister ofc.Not agree Diameter for canister and fins in general are not retractable
Look very good missile for S-400 48N6M range 200 - 240 km as last HQ-9 or HHQ-9B diameter 52 cm do the canister but he do 7.5 m long and the HQ-9 only 6.8 m ( - 10 % ) and for volume so logicaly can be only more big ( + 10 % do 57 cm ) and Almaz Antey build the best SAMs since 50 years.
Warhead can be more small for do room for fuel not for SAMs and can dépends speed for supersonic missiles can be different of subsonic which consumes much more less and are clearly less big in general.
And also confirm the weight of the HQ-9 to at less 1.8 t and not 1.3 t as it is possible to see sometimes and then logicaly a diameter " enough big " but it is very difficult in more the diameter with or without fins is not precised in general for VLS and canisters again more difficult to have dimensions.