It must be similar to FPP SBF reinforcing oil pan rails -

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have not mastered pictures posting,but send me your email to   2manygoals@gmail.com  at cliff and will email pictures,i get gaskets this week so will have picture of package. which consists of a water cut reinforcement for rear of oilpan a much better oil pan gasket,thicker and a denser coark material.  the plate  puts presure on the raised  dimples to get a better clamping at the rear wher the rear seal retainer is a trouble some aria   other isue is my computor of 20 years crashed so will have a new 1 monday,so useing my wifes  mail for a few days. thanks  for your interest

simler  but only for rear of of the pan,your picturebis for a sb ford,not a y. also included is a better gasket, thicker and more dense cork.
send me your email and will forward some pictures(have  not mastered  getting pictures to this sight.  ct1940@shaw.ca