I sent an e-mail to the supplier of said LIP SEAL upgrade ...and below is the return answer:
Yes we have fitted 6 in total to date in MF35 A3.152 and MF135 AD3 152
We had no problems and the longest has been fitted a year,
we have had no problems with the installation and have had no leakage and would class the modification a success and would recommend
full instructions are included and were easy to follow, most were fitted to engines with many hours on the clock, only 1 was a rebuilt engine but the crank had been ground and we no problems
We believe if this was fitted to a very worn engine with the crank moving about excessively , this may also work due to its flexibility but this theory is untested at the moment
If anyone knows of a supplier of said LIP SEAL upgrade in the USA / CANADA I would purchase then from them. As is I am looking at purchasing out of the UK.
Bob (John Deere D)