The L450F winches are Harken 2 x 60.2ST, 2 x 50.2ST and 1 x 40.2ST.
I just serviced mine last week after 5 years. The 4 up top were really good and didn't really need the service and the dinghy one needed a bit more of a clean and re-grease. I wouldn't bother with covers?
The first one I serviced took 2 hours but getting more logical with laying out the gears got it down to 40 mins.
Are the Code 0/ spinnaker winches the 50.2 ? I need to install 2 on my S, also I found Harken Canvas do a great winch cover and bought those at the same price as locally made ones but Harken are a much higher quality.
Dave is correct, sizes are Harken 2 x 60.2ST, 2 x 50.2ST and 1 x 40.2ST.
But unlike Dave, I would recommend covers. We've been in locations/anchorages where dust, grime, coal soot, sand blows all over your boat and you'd want to avoid this getting into your winches.
The 450S has three 60s at the helm station for halyards, reefs and sheets. The spinnaker and Code 0 sheets can't run to these like they can on the F so winches are mounted either side of the cockpit above the aft berths. It's these two I need to install and guessing 50s would be best for this purpose. Any one with an S that can advise the size Lagoon installs?