Arkie John,
Take the Handles off the valves
Take the valves and the handles to a Local Hardware store (Note: NOT A BIG BOX STORE) that sells propane and/or grills, etc.
They should have replacement (pipe size/ threads) valves.
Then see if you can get the handles to fit onto the new valves and you will be in business.
Important that you take the valves with you.
If you don't there is an old saying: "You can't make just one (1) trip to the hardware Store"
Good Luck !
1perchjerker