For sale is the oil passage collar from a 1974 Honda CB750K4.  This will fit the following models:

CB750  69 thru 78 (K0 thru K5, 76 thru 78 K) / 75 thru 77 F / 76 thru 78 A (Hondamatic)
CBX  79 thru 82
VTR250  88 thru 90 A (Interceptor)

This is the part that is located at front of the crankcase and goes between the upper and lower crankcase.  The O ring gasket is included and in good condition and can be reused.  Please feel free to email at any time if you have questions concerning this item.  I gladly ship worldwide. I combine shipping cost for multiple purchases.  Si usted prefiere comuníquese conmigo en español.  The vast majority of what I sell are used parts.  I try very hard to describe the item for auction accurately.  Sometimes however I can miss something in the description.  If you feel the item is not described accurately....please contact me before leaving negative feedback or a low (1 or 2) stars in the "Item was described accurately" category.  I think you will find that I am a responsible seller and will try to resolve any issues so I can earn your five star rating.