Replacing boosters

[mommaof2boys]

I haven't needed to buy car seats in years, but our last HB Turbobooster expired (used for booster-training DS5) and we were rear-ended today as part of a 13-car pileup so I've got three seats that need to be replaced. I have a Tranzitions that DS5 can use harnessed as his primary seat but need a new booster for him to train in our second vehicle. Do Turboboosters still fit the same way they did 10 years ago? Should I get him another to replace the expired seat?

DS7 has been in a HB Kidfit in our main vehicle that I need to replace. He has a decent fit in the bottom of the Keyfit without the back. Is he probably safe to move to a backless booster all the time? Is the GoFit the same as the bottom of a Keyfit?

DS7 sits well in a booster and has trained with the backless booster from the Tranzitions in our second vehicle. Is there a backless booster that fits the same way as the Tranzitions bottom?

Are there any other newer boosters that I should consider?
DS5 is 44lbs, 44" and DS7 is 52lbs, 47".

 

[mommaof2boys]

Maybe if I simplify my questions I'll get some answers?

Do Turboboosters fit the same way they did 10 years ago?
Is a Chicco GoFit the same as the bottom of a KidFit?
Is there any booster like the bottom of a Tranzitions?

 

[ketchupqueen]

Yes, TurboBoosters have had a few superficial changes but fit is the same.
Yes, a GoFit is basically the bottom of a KidFit.
There's nothing identical to the bottom of a Tranzitions; if you have a specific dimension you want to match, there might be something close.