Bernie,
When I bought my Weber's as set came with them. I never used them at all. If I can find them you are welcome to have them. They are in the garage somewhere, I'll have to look.
If you need them sooner look on the web at
http://www.inglese.com/
They will have a set made just for your application. I have no idea what they cost since they came with my 44IDA's years ago.