Salisbury Oil Gasket

Hi all,
I have a leak and am going to change the cork gasket on my front salisbury.
All I found was RTC1139, for witch it says is for the rear salisbury.
Can some help me with the part number for the front one.....or are they the same?
Are the aftermarket ones OK? Or is it better to go genuine?

Anyone?

I only have a salisbury at the rear. Looking at your truck, is the front the same shape and size as the rear (I can't see why it would be any different) ? If so, it will fit.

Is the leak defiantly from the seam? Mine was leaking from the filler hole as it was stripped. The solution was to replace the cover and gasket.

OMG stupid me....just checked, of course its not sslisbury in front. Its a 2003 TD5 110. What would the part number be for the gasket?