Yes, those are original. The rear lamp guards are too.
I think you might find this site helpful for a lot of the basic info re: RRC > 1990 Range Rover

> RANGEROVERS.NET HOME

 

Bad news. I found somebody to know something about the car and he told me that there is a crack at the engine block. They kept the the car outside about 3 years and never drained the coolant. So engine block cracked at very cold winter days I guess

 

I'd call that VERY GOOD NEWS!!!! You just saved yourself a bunch of money and a HUGE headache. Good on you for really looking into the truck before you bought it. You'll find another, just keep looking.

 

Great news! Tell them you’ll take it off
their hands and own a classic for free. Find a donor somewhere and your set.

 

Not true. The empty ones don't leak.

By the way, if you can do the work yourself an engine isn't too hard to come by.