This auction is the swing plate assembly on the laserjet 4200 / 4250 / 4300 / 4350/4345 (N/TN/DTNS/DTNSL/MFP/DTN/TNSL/L/LN/LVN SUBSET)  Printers.  Please look below for models that support this part.

PROVIDED IN THIS AUCTION IS (1)  BRAND NEW SWING PLATE ASSEMBLIES, PART # RM1-0043
This kit has no directions or support, so please buy the kit if you know how to do the repair.  The repair for this part is extensive and I would suggest you read a manual and fully understand what the repair entails before purchasing.  

HP LaserJet 4200L printer Q3993A, Q3993AR
HP LaserJet 4200Ln printer Q3994A
HP LaserJet 4200Lvn printer Q3995A
HP LaserJet 4200 Q2425A, Q2425AR, Q2425Q, Q2425V
HP LaserJet 4200N Q2426A, Q2426AR, Q2426V
HP LaserJet 4200TN Q2427A, Q2427AR, Q2427V
HP LaserJet 4200DTN Q2428A, Q2428AR, Q2428V
HP LaserJet 4240n Printer Q7785A
HP LaserJet 4250tn Printer Q5402A, Q5402AR
HP LaserJet 4250dtn Printer Q5403A, Q5403AR
HP LaserJet 4250dtnsl Printer Q5404A, Q5404AR 
HP LaserJet 4300 Q2431A, Q2431AR, Q2431Q, Q2431V
HP LaserJet 4300N Q2432A, Q2432AR, Q2432V
HP LaserJet 4300TN Q2433A, Q2433AR, Q2433V
HP LaserJet 4300DTN Q2434A, Q2434AR, Q2434V, Q2434VR
HP LaserJet 4300DTNS Q2435A
HP LaserJet 4200DTNS Q2446A, Q2446AR
HP LaserJet 4200DTNSL Q2447A, Q2447AR, Q2447V
HP LaserJet 4300DTNSL Q2448A, Q2448AR, Q2448V
HP LaserJet 4350 Printer Q5406A, Q5406AR
HP LaserJet 4350n Printer Q5407A, Q5407AR
HP LaserJet 4350tn Printer Q5408A, Q5408AR
HP LaserJet 4350dtn Printer Q5409A, Q5409AR
HP LaserJet 4350dtnsl Printer Q5410A, Q5410AR