11P3509 up for sale is a nice self aligning bearing that was made for a aerospace or airplane application, this has a bronze outter race and a stainless inner member, this unit would be great for a kit plane race car hot rod or drag racing car,  this unit measures 0.934 long x 1.124 OD major,  the inner diameter looks precision ground and is 0.498 dia, the outer race is 0.401 wide, the inner race has a flange that measures 0.656 dia, this item is covered under part numbers SWPCO BLR-8420  , 215-00443-1 NSN 3120 00 880 2304  addititional data below,

these are over $150 new from manufacter,

3120-00-880-2304 Characteristics Data
MRC	Criteria	Characteristic
MATT	MATERIAL	STEEL INNER MEMBER COPPER ALLOY OUTER RACE MEMBER
SFTT	SURFACE TREATMENT	CHROMIUM INNER MEMBER
STYL	STYLE DESIGNATOR	11B WITHOUT INSERT OR LINER
ABXV	BORE DIAMETER	0.4995 INCHES MINIMUM AND 0.5000 INCHES MAXIMUM
AGGF	OUTER MEMBER OUTSIDE DIAMETER	1.1245 INCHES MINIMUM AND 1.1250 INCHES MAXIMUM
AGGH	OUTER MEMBER WIDTH	0.3960 INCHES MINIMUM AND 0.4060 INCHES MAXIMUM
AGGJ	INNER MEMBER WIDTH	0.9320 INCHES MINIMUM AND 0.9370 INCHES MAXIMUM
AGKP	STATIC RADIAL LOAD RATING	14900 POUNDS
SR-1	MANUFACTURERS CODE	80378
SR-1	MFR SOURCE CONTROLLING REFERENCE	215-00443-1