What's the deal with the Poly 318

oem ones are plenty rare and pricey. I used to seem them occasionally back in the 90's when I went to Nats and Carlisle, back when some folks had some real rare parts to hawk, not used steering pumps, and alternators!! ha

They are the small oval ones.

http://www.ebay.com/itm/1962-mopar-...ash=item25a8ae015c:g:hiEAAOSwPcVVisM7&vxp=mtr