Garagamus, that tab looks like the seat has been fitted at some time with the tab not correctly under the tank mount but above it, then the seat sat on bending the tab up, the tab should be level with the seat base. Easily starightened for sure, just didn't want Rush making one wrong. 
And it'd be a shame to cut up the near perfect seat pan
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And it'd be a shame to cut up the near perfect seat pan

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