Extra strong main spring (Yellow/Green)

You'll find this spring called out across a wide run of telescopic fork figures - 6T, TR6, T120, T100C, T100R, TR6R, T120R, TR6C, and T120TT variants all show up in the catalog listings for it, along with steering damper assemblies on some of the sidecar-outfit forks. Given how many different fork figures reference this part, it's clearly a common service item across the telescopic fork family, but exactly which years and models it suits on your particular machine is worth confirming against your fork internals before you order.

Because this is a stiffer-rate spring than the standard fitment, it's the one people reach for when the front end feels too soft for the load - loaded touring, sidecar duty, or just wanting more support under braking. Springs of this type are usually replaced as a pair rather than one at a time, but check what your own fork legs currently have installed before assuming both need swapping.