Reddit reviews Shimano RD-A070 Road Rear Derailleur - 7-Speed, Smart Direct Mount

https://www.amazon.com/Shimano-Tourney-8-Speed-Mountain-Derailleur/dp/B00O7XMG1C

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Like that one?

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There are a couple of others that want me to chose between 'direct attachment' and 'with riveted adapter' like this one:

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https://www.amazon.com/Shimano-RD-A070-Road-Rear-Derailleur/dp/B007Q4PBNO/ref=asc_df_B007Q4PBNO

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Thanks.

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Watching youtube videos about how to replace and adjust a derailleur right now...

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(edit: also https://www.amazon.com/Shimano-RD-TY300-Derailleur-Compatible-Upgraded/dp/B01GO02W5K/ )

ok last thing http://www.amazon.com/dp/B007Q4PBNO/ or http://www.amazon.com//dp/B007Q4PGPM/

whats the dif with Smart Direct Mount or Smart Mount with Bracket

That's a long cage, which you probably won't need looking at your bike.

See this link for more information on cage length.

http://www.amazon.com/dp/B007Q4PBNO/ might be better. Read the above link though and work out what cage length you need.