The given clues are a cryptogram, and decrypted read:
63: Jerry's bitter rival
13: Either of two different Brazilians from the last two World Cups
64: Author of Ivnahoe (sic) and The Lady of the Dead Sea
13: Ali fought one in the jungle
64: Very, very tough magical flying car
65: Member of Alex Bell's club
13: Artists of Master of Polenta and Enter Sandman
63: Famous snowman
64: One who fought and tilled for your wee bit hill and glen
13: Anakin's son from Hoth
65: Expanding sixties British music television programme
13: He likes big hominy and he cannot lie
13: My Little Pony's Princess Twilight
64: Any of five cats in The Simpsons
64: Chilly successor to Moonraker
These are each clues for punny names given to Scottish gritters:
SALTY TOM
FRED
SIR SALTER SCOTT
RUMBLE
GRITTY GRITTY BANG BANG
POLAR BEAR EXPLORER
GRITALLICA
FROSTY
PLOUGHER O' SCOTLAND
LUKE SNOWALKER
READY SPREADY GO
SIR GRITS-A-LOT
SPARKLE
SNOWBALL
FOR YOUR ICE ONLY
As additional confirmation, the license plate of each gritter (2 letters, 2 digits, then 3 letters) has the given two digits in the middle:
FN63CYH FH13RPX VE64BKU SN13BVC PE64BXZ SJ65FVY SN13BVE FL63KUG PK64PPY FH13RPZ SK65BOU SN13BUF FM13DFG VX64JWD PJ64DDN
Decrypting the last letters with the same key at the clues produces ANSWER FIRE STICK.