Вот описание процедуры для Аванта (на аглицком, лень переводить):
1 - Front luggage compartment floor covering
Unscrew bolts -2- (4x) for fastening rings -3-.
2 - Bolts (2x)
Tightening torque 4.5 Nm
3 - Fastening rings
4 - Luggage compartment floor covering underlay (FWD)
Remove front luggage compartment floor covering -1-.
Pull out rear luggage compartment floor covering -7- to rear.
Remove luggage compartment side trim on one side → (процедуру снятия боковых панелей см. ниже).
Take out luggage compartment floor covering underlay -4-.
5 - Luggage compartment floor covering underlay (Quattro)
Pull out rear luggage compartment floor covering -7- to rear.
Unfasten side luggage compartment floor covering on left -8- and right -6-.
Luggage compartment floor covering underlay sections -5- are secured with butyl cord.
Take out luggage compartment floor covering underlay sections -5-.
6 - Side luggage compartment floor covering
Secured with adhesive tape
7 - Rear luggage compartment floor covering
Pull out to rear
8 - Side luggage compartment floor covering
Secured with adhesive tape
Боковые панели:

1 - Luggage compartment trim
t Removing
– Take out load compartment cover.
– Remove rear seat bench → (приподнять переднюю часть задней сидушки и потянуть вперед)
– Remove appropriate side padding → (крышки какая-то, становится видна после снятия сидушки. там 2 болта, один сбоку, один снизу, в торце. судя по картинке, их расположение - очевидно).
– Unfasten appropriate lower seat belt anchorage point → (просто открутить болт нижнего крепления ремня)
– Remove seat belt trim → (см. ниже)
– Remove rear cross panel trim → (Это порог багажного отсека со стороны 5-й двери. 4 болта со стороны багажника).
– Unscrew bolts -4- (2x) for fastening rings -3-.
– Detach cover -2-.
– Unscrew bolt -6- (1x).
– Unscrew bolt -7-.
– Unclip rear trim.
– Pull trim slightly forwards and unplug connector for rear socket.
t Installing
– Engage luggage compartment trim at side window flange.
– Perform remaining installation operations in reverse order of removal.
2 - Cover
3 - Fastening rings
4 - Bolt (2x)
q Tightening torque 4.5 Nm
5 - Holder for load compartment cover
6 - Bolt (1x)
q Tightening torque 2.5 Nm
7 - Bolt (1x)
q Tightening torque 2.5 Nm
Снятие направляющей ремня заднего пассажира (для чего-то приведено в статье про боковые панели):

Removing and installing seat belt trim
– Use screwdriver to prise out retainer tabs -2- (2x).
– Pull out seat belt trim -1- in direction of arrow.
– Thread seat belt out of seat belt trim -1-.
Все, кроме описанного выше - никаких клипс там нет. в стоке, по крайней мере.