Need help saving my old 8500 Mac -no startup disk



I have an older PowerMac (8500/132) that I lost the OS disk to, and had to wipe clean to use the HD for something else, and bought OS 7.5 on Ebay, but it won't boot to 7.5 (I think it has to be 7.5 or greater. Can someone email me or give me a link to a startup disk file or something that will at least get me to be able to boot up? Then I can install 7.5 and be back in business at least.
Thanks so much for any help anyone can give, 'cause I miss my ol' Mac.

[email protected]

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