This is off of my RMZ450. I’m trying to determine if this is actually “kit” material. What brought this to my attention was when I brought the shock to the shop to have a new bump stop installed, the normal bump stops he keeps in stock for the 16mm shafts did not fit on this shaft. The measurement I got was a diameter of 18.53mm. I’d also like to note that this bike belonged to Teddy Parks at one time. The suspension was set up for Supercross when I got it. Only things I could find was a number 20 and the letter “N” stamped on the bottom. What’s your guys thoughts? Is this possibly an A kit shock?