Paul George -- Check Out My Amazing New Car ... That I Can't Drive

Paul George sadly showed off his sick new Ferrari on Instagram Tuesday -- which, of course, he can't drive -- but TMZ Sports has learned George was originally supposed to get the car the night he suffered that horrific broken leg. Double ouch!

The folks at RoadStarr Motorsports tell TMZ Sports ... they had to customize George's Ferrari 458 Spider with a "big man conversion" to fit someone of George's height ... 6'9".

George's ride was also upgraded with an all-new sound system. In addition, George customized the wheels, lights, roof and all the logos and emblems on the car ... all in black.

The car goes from 0-60 in 3.7 seconds and cost around $370,000.