What diameter is your Roll bar 21 or 23 mm or something else? You've got to think 'outside the box'. We cant hold your hand for your 'shopping'.
Re-read my post #2 where I mentioned that the Spark was the 're-born' Matiz. So, think about it...... If they used the same diameter roll bar on the Spark as the Matiz (21mm) then these are available online from Energised Customs Powerflex. Think. think, Search, Search.
Forum Member Scouse-Mafia posted a link a year or two ago on a supplier of Chevrolet parts. Use the Forum Advanced Search tool.