Oil flasher units were discontinued from here on. There was no part number change to the oil pan because a cover plate A90473 and gasket A90474 was added to the oil pan A90422 to eliminate the hole for the indicator unit in the pan.
When the stock of those oil pans was depleted the factory used 850X oil pan A90486. The time of this running change is not known exactly.
The 8 cy oil pan gasket A8-241 fits between the pan and the engine block.
It is secured to the block with four SA505 cap screws, used on the front of the oil pan, screwing into the bottom of the timing chain cover.
21 SA506 cap crews are used for the remainder.
There are six 11S2 copper seals (washers) used on both the front and rear of the pan where the bolts go into the oil on the other since. These are backed up by WZ9005 flat washers. This is necessary to prevent oil seepage around the threads.
There are 19 WB5 lock washers used on the bolts that do not have the copper seal and WZ9005 washers.