Solo/K&N airfilter.
Solo partnumber: 2500580
Previously this was the RP-5164 (cylindrical with CFC top) however this is no longer available and has been replaced by the R-1060.

Suitable for self-launcher with Solo engine:
2625 02i (Ventus-3M, Arcus-1.0M, Arcus-2.0M)

Di=49mm
Do=76mm->51mm
L-filter=76mm
L-flange=16mm
L-total=92mm