Rear seat belt extender

[MGRLBR]

My convertible car seat in the rear middle position is covering the seat belt buckle behind the driver's seat. The opposite side buckle is reachable.

Any ideas for parts to extend the seat belt so it can be buckled properly?

Pic attached

Thanks a lot

[euro-r]

You can buy seatbelt extention online

[MGRLBR]

Generic one should do? Pretty cautious when it comes to seatbelts...