Terry,
Sorry I can't help you directly, however, when I was in the UK last year I visted a shop called Leigh Classic
Motorcycles. Andy there had an unbelievable assortment of parts. I looked at his website and he appears to be listing the push rods you are looking for. I don't know how much you know about parts suppliers, but if you need advice on more of them, let me (and the rest of us) know. I think we probabaly all have our favorites and I don't suppose I knwo of the half of them.
I can't wait to see the finished bike an hope you post some pictures along the way (or have you already?)
Richard