200TDI Defender 93. Had engine out to remove ladder bolts. Vertical rubber t-seal legs were shortened on rear main bearing cap so decided to take the cap off and replace (with rubber-Reinz lwr engine gaskets). Made pair of 70 degree angled blocks to bolt on either side of cap recess to guide seals in. Trimmed off the 90 degree edge on the outer side of the t-seal horizontal legs (V. small amount with scalpel). Greased ends of caps and rubber seals and slope of steel guides and oiled crank journal. Then wriggled, shoved and finally, tapped cap in with a rubber hammer. Checked for correct orientation and screwed in the old bolts. Left at present because unsure whether, like the fibre ones), you should allow them to shrink back a little before cutting off the protruding rubber ends. Will trim later and replace bolts with new and torque up. I chose 70 degrees for the guides because I had no information.