I don't know if it is possible, but my gut feeling says you should sell your LA125 on craigslist or other classified and buy a good used LA145. I think you will be able to do that just as cheaply disassembling your manual PTO and converting to an electric clutch. There are lots more issues than just mounting the clutch. Now is a good time for selling a mower. I think an upgrade would be the best choice and I see lots of used LA145/165/175 mowers for sale with low hours on craigslist in my area.