I think these style levers, especially with cut-outs, prominent lever tips and very angular ergomonics, are too sporty for the XSR700 and look pretty generic at that (i.e. somewhat sharing the standard $20 ebay Chinese lever style).
The best fit, imho, are the Gilles Tooling ones (B34-FCLLE / B34-FBRLE-00-00, not the FXLs), although they're only available in a full finger version (and non-folding).
Otherwise some of Rizoma's (specifically the LBJ / LCJ range) seems a decent bet (stupid price alert!).
Personally, I went for a pair of fully Blacked-out CRG RC2 for an industrial and non-generic look.
(I opted for shorties, although their ergonomics means they're a hybrid size, comfortably allowing 3 finger use, if required.)
They're not perfect though, and had Gilles Tooling made a short version of the above lever, that's likely what I would have gone for (despite, again, daft pricing).
HTH