I'd have to double check on the spare lid but I wouldn't bother sending it to avast anyway. If it were me, I'd likely go the vertex vectra route of those two choices. Reason being is that the vectra is routed so the collection cup goes into the lid. Avast used to have a routed out channel in the underside of the lid but as I understand it, they eliminated that feature.
For lid size, you need a 180mm Vectra or Swabbie lid which will match your skimmer. Personally, I use an AquaDriver Skim Clean which is by far the best self cleaning head you can get. It uses a gear driven motor and has a persistaltic pump built into the head that draws water up from inside the skimmer body and distributes it across the wiper blade for a wet scubbing. It works much better than the traditional wipers from Avast and Vertex but any wiper is better than no wiper in my opinion. Mine also has a wash down for the collection cup that I can activate via my Apex. This is the same head cleaner than was or is offered by Bubble King but unfortunately, they are hard to get in the US and run several hundred dollars. So now that I teased you with something that is tough to get, I'd go with the Vertex and keep your stock 180 lid in a box set aside in case you ever need it.
The stock cups and lids and not stocked in the US that Im aware of. They would have to come from Germany.
This is my AquaDriver SCH setup.