273 Front Main Seal Question

I'm guessing that this new seal isn't for my timing cover then?

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It likely is, not all seals including rear axle and front wheel seals, or even transmission rear seals are built alike. For example, the OEM Mopar slip yoke seals famously had a long extended boot, and many aftermarket replacements don't. lay the cover down with the stamped number you posted earlier down, and try to find a big socket that will fit through the timing cover hole with little clearance and drive the thing out. If not, devise whatever. maybe split a 2x4 and do some whittling.

Drive the new one in from the front side, making sure the side that is to the outside of the cover is the side in this photo you posted.

You want to "cover" as much of the seal as possible until you get it flush, so lay a chuck of 2x4 clear across the seal. Support the timing cover so as not to stress/ crack it