Tree Tool & Die 2VG Sight Glass Oil Window One Per Order

Tree Tool & Die 2VG Sight Glass Oil Window One Per Order.  There are 3 available, 1 per order.  These are new unused condition and have been stored in an oiled bag.  They are not marked and the bag was only marked sight glass.  These came with some other Tree 2VG parts so I am assuming that is what they will fit.  I show diameter in photos.  Please check fitment and compare to your old glass prior to ordering.  Please review all photos to determine condition and identification.  Item is sold as is with No Returns.  Will be shipped via USPS 1st Class.