This set contains 7 items that are compatible with the Canyon ArenaLoopStraight blocks (3-9-x): 

Inverted versions of ArenaLoopStraightSlope and ArenaLoopStraightSlope2
Mirrored versions of those items
An itemized version of ArenaLoopStraight, plus double- and quadruple- height versions

To use these items, copy the ArenaLoopStraightExpansion folder into your Canyon items directory:

Documents\ManiaPlanet\Items\Canyon