This is the Smashpot coil conversion assembly for a Yari / Lyrik.
It’s set for 150mm travel for a 27.5” fork with a 50lb white spring for my 85kg riding weight. I bought it fully assembled from TF Tuned.
It’s an easy swap for the air spring, being the same steps as a spring swap (plus removal of the air top cap)
Smashpot details here https://www.tftuned.com/vorsprung-smashpot-fork-coil-conversion-system/p3529
The Smashpot can be configured for 130 – 180mm (subject the stated maximum fork travel) and the spacers are included although a spring swap might be needed depending on riding preference.
£180 posted, no payment fees included.