My sisters bought me a shift **** from Rick's for my '95 Z for my birthday, but it didn't come with a jam nut that fit the stock thread. Long story short, I tried to use it and it cracked. Rick's is sending me another one, but I need to find a jam nut. Has anybody found a jam nut/boot retainer combo that works for our cars? If you have, could you link the item? Thanks.