Child Carseat Options

[Fr3AkAzOiD]

Was looking at a '99 vert this morning and the wife wanted me to hook up the front facing carseat as our daughter will be in it for the next couple of years.
With no anchor or latch system I could only use the regular seatbelt and even pulling it all the way out so it locks and putting my weight into it and feeding all the slack I could back it was way too loose to be acceptable.
The rear seats not being a flat bench don't help but the biggest thing is not being able to latch the top of the carseat to anything. There isn't even a headrest to secure it around.

Any of you with kids in a carseat have any sugestions?
This is going to be a third car so it won't be used all the time but I still need to make sure my daughter will be safe while in her carseat as well as when she graduates to a booster seat.

[CoreyST]

I don't know how you can't get yours tight, mine won't budge and my 2 year old fits perfectly fine.
All I did was when I pulled the belt I pulled the bottom strap as tight as possible then pulled the top strap tight, and as I said it fits snug and doesn't move.