you know how theres a plastic in the middle backseat of a 2door integra? well i been wanting to know if there is a 3 person backseat for this. or can it be modify? do they sell any seats like these?

 

No such seat exists, nor is there a way to safely add a center rear seatbelt.
Sorry, but you're out of luck.

 

He probably wants to know if you can swap in the DB rear seat bottom/seats into the DC chassis.

 

No dice. It won't work. The seat bottom is too wide.
Even if it did fit, there are no mounting points for a center lap belt.

Also, think about where the center passenger's head would go in a head-on collision. The liabilities far outweigh the benefits.

If you need to tote 4 passengers, buy a DB7 / DB8 sedan.

 

the jdm sir-g seats dont have the plastic tray. however, there's still no provisions for a middle seat belt. i'll post pics of mine later

 

not my picture, but same seats.