We are happy to assist you with this information Bean

https://litecomparison.com/graco-extend2fit-2-in-1-vs-3-in-1/

This car seat has not been tested in every vehicle available on the market, but it has been tested in compact, mid-size, full-size, vans and SUVs from different manufacturers. It should be able to fit in your vehicle. If you have any questions regarding the proper fit in your vehicle we recommend that you take the car seat to a local Car Seat Technician that can assure that the car seat is installed properly. You can also contact Graco Consumer Care at 1-800-345-4109 and select the option to speak with one of our Certified Car Seat Technicians. 

We are happy to assist you with this information Bean! This seat has the "Simple Safe Adjust" harness. It does not need to be threaded to adjust the height. Instead the headrest of the seat can be adjusted by a button. 

The Dimensions of the Extend2Fit In Most Common Positions: Weight of Seat = 19.25 Measurements (Depth x Width x Height): Rear facing recline 1, Head rest 1, Extension 1 (RF, most recline, lowest head rest, Extension closed): 28 x 19.5 x 18 Rear facing recline 4, Head rest 10, Extension 4 (RF, most upright, highest head rest, Most Extended): 32 x 19.5 x 30 Forward Facing Recline 4, Read rest 5, Extension 1(FF, Most recline, est. lowest head rest, Extension closed): 24.5 x 19.5 x 25 Forward Facing Recline 6, Read rest 10, Extension 1(FF, Most upright, highest head rest, Extension closed): 21.5 x 19.5 x 33.5 

No-Rethread Simply Safe Adjust Harness System allows the headrest and harness to adjust together in one motion     Choose the perfect headrest height from 10 positions to get the safest fit for your child as they grow     6-position recline keeps your child comfy and helps for a better installation       Push-button InRight LATCH provides an easy, one-second attachment with an audible click to help ensure secure installation     Fuss-free harness storage pockets conveniently hold the harness out of the way for easy in and out     Harness storage compartment keeps the harness safely stored while in belt-positioning booster mode

Convertible car seat grows with your child from rear-facing harness (4-50lbs) to forward-facing harness (22-65 pounds) Made of Steel reinforced | Product dimensions – 20.75” D x 19” W x 24.5” H | Product weight – 19.25 lbs. Up to 50 pounds rear facing, allowing your child to safely ride rear-facing longer Graco Protect Plus Engineered | Simply Safe Adjust no-re thread headrest and harness adjust together 

3-in-1 car seat grows with your child from rear-facing harness (4-50 lb) to forward-facing harness (22-65 lb) to highback booster (40-100 lb) Extend2Fit 4-position adjustable extension panel provides up to 5″ additional legroom, allowing your child to safely ride rear-facing longer Up to 50 lb rear-facing, allowing your child to safely ride rear-facing longer Graco ProtectPlus Engineered: a combination of the most rigorous crash tests that helps to protect your little one in frontal, side, rear & rollover crashes