Cant fit solofix car seat into a toyota

2 possible places L and R bottom of seat bolts or inbetween bottom and back bolts or straps inbetween seat and back simply pull up or push seat in LS and RS pull up and out

The door catch is down or has lost a spring inside the hook
No simple fix but too replace door latch inside
In order to drive car with door that way no back seat passengers till fixed but use tie down ratchet straps from door to door inside handles
This will keep door shut then can drive vehicle normal till door catch is fixed its simple hour job to replace just buy parts have mechanic shop install

Two steps:
1) Inside the car under the rear seats there is a carpet flap that needs to be lifted, under it you will find a plastic lid. Remove the plastic lid under which you will find the fuel lines and electrical cables for the fuel pump and fuel gauge, remove all. Noting exactly which fuel line went where. You will have to remove all the fuel in the tank. Siphon it off or if only a little is left you can do it in the next stage.
2) Jack up car at the rear on both sides. The fuel tank is held by two metal straps that can be released with two bolts. Losen bolts without removing them completely then loosen all hoses and check that the tank is empty. If it is empty place jack under the tank (with wood to spread the load) and take the weight then remove the bolts so that the straps are free. Slowly let the tank down.

I am not familiar with the vehicle but car seats are not all made to fit any vehicle.
There are some that require just the lap belt most require an over the shoulder design. You will have to get the store to let you try a few in the vehicle until you find one that suits. I would expect a young child (baby) seat to require a 3 point over the shoulder style seat belt. especially if you are fitting the seat in the middle as this is the worst place in the event of a head on impact, unless you have full restraint. The other thing to remember is that children as they grow older may decide to take the shoulder straps off as you drive, making them more vulnerable. There are devices out there to help prevent this.
If your vehicle doesn't have a three point harness in the middle you should be able to get one fitted. Ask you Toyota dealer if there is an approved after market belt

Cylinder head instructions

Tightening sequence

Cylinder head torque setting for 2004 VW 1.4L 16V fitted in Seat Leon
Renew bolts
Stage 1 = 30 Nm
Stage 2 = 90 degrees
Stage 3 = 90 degrees

The rear has space for 2 seats...right?. Contact the dealer.

on the top of the back seats thers 2 leavers.drop them down and push seat towords front of car and then pull up.

I think you should try this website www.reliable-store.com It helps you repair your vehicle easily without more help. Ask the girl in chat at the bottom of the page

I have had a similar problem on my 2004 Siena 2 times - strap you pull to release the seat has no tension. Dealer fixed under war both times (I watched the second time). If your problem is the same, the cable that controls the release may not be in position. As I recall, you remove about six screws, remove the plastic housing, find the cable and reset then test the release.

On rear seat, remove it by lifting it up, then look down there for the missing hook or belt. When replacing the seat, you have to insure all the straps are on the seat before pushing in and down to replace the seat. It just pulls up and pushes down.