Adrian,
IMHO:
Tell him to spend the $$ on OEM GM #25537476 cable!
I went through several after-market ones & they ALL failed
The vendors here on the board sell 'em .
They run about 3x $$ what the repops do, but there is a design flaw in the aftermarket ones
(I'm pretty sure only one source makes /imports 'em from Israel)
money spent on OEM will pay for itself ( & I'm a CHEAP bastard...)
Do a quick search & you'll find my post & others who have had poor results from repops
HTH!
D