If the engine has become difficult to start or runs unevenly, the throttle bodies may require overhauling, new O-ring seals and adjustment tension springs for example.
If the plated finish on the various throttle body fittings is looking a little tired, then new screws and plated parts will also improve the overall appearance of the engine.
Other related parts you may wish to consider:
Why not take the opportunity to improve the performance and the aesthetics of the throttle body assemblies at the same time? Add as many items as you wish to the same shopping cart, new clips 0940106101, pilot Screw O-rings 1329529900 and spacer 0918006310 for example, and still only pay the same single fixed price shipping cost. This component may have other applications within the Suzuki model range.