Thanks for your advice
Unfortunately (as you know) "genuine" GM rags are not available, or I would just buy one.
So, I have a choice of an $120 aftermarket assembly, or I rebuild mine with aftermarket parts.
The end result is probably the same and I need to fix it now, it's F-CKED !
I figure a rebuild kit is better than doing nothing and this one looks better than most.
Again, thanks for your advice.
Cheers