I would go the $110 route.
on eBay.
And just slap it on.
Truck is not worth any more consideration and care and you'll just throw money down the toilet.

If you want to give money away, you can give me some...

In the meantime

LHG000060G | eBay

 

I think these have a KEY in them too.
The key may be shaved off on the crank.
You need to dig out the key way.

 

Mystery has been solved !!!!!!!!!!!!!!!
There are the 5 different ones 5 gram. 10 gram. 15 gram. 20 gram.
and 30 gram. For the 2000 to 2004 Discovery II 4.0 engine.
The harmonic balancer are all the same part, except for the small weight
that attches to the hub, looks just like a wheel weight for a car wheel, for
balancing tires.
So all you have to do is safe the weight off the old harmonic balancer,
and install it on the replacement one, if it does not have the same weight
you need.
Thanks for everyones input.