need 250 penton

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I am attempting to build a Bultaco killer in my Vintage 1973 250 Penton and I am needing to replace some parts that my ex-wife took with her.  I am hunting a stock roller frame and/or a short track roller frame.  I think I have already aquired a head and intake manifold, however if there are anymore out there that are available, please let me know.  Thank you in advance.