Welcome, bike looks sweet. I am also newish now, this is a brilliant forum
but do search and read the tech notes in all the forums.
The Wilbers is not cheap

, AUD$1100, it does have lots of adjustment and for another AUD$400 you can add a hydraulic pre load adjuster. [Easy adjust for pillion or luggage]
The cannister , in my case because of the angle they fitted the hoses, now goes on the left and I fitted the pre load to the rh rear peg, [drilled and tapped] to hold. We had to guess the length of the preload hose as Wilbers had no spec, I went for 50cm, was perfect! Fluke!
It being there means I can reach it to adjust preload with my luggage strapped on.
Wilbers asks your weight, riding stlye and usage and the sets the shock and spring to suit.
Preload was perfect and you would only play with the adjustments if your were tracking or had a lot of weight on board, like pillion and luggage. You now maintain the correect steering geometry and won't rub a big hole in the under tray!
The Penske was about $USD900 I think.
Quite a few original shocks on ebay at times, for $50 or so. Then wait for a second hand Penske to come along and get into a bidding war
I had my other shock rebuilt, [2nd bike] but it was complete.
You may be able to rebuild it without the adjuster working any way.
One thing about your tyres having a worn flat profile is that, in my case, I found that the bike was a real pig to turn at low speeds. New Metzlers and it was transformed. I remember commenting about the famous Ducati slow steering was a pain, but it was just poor tyres!
A tyre should be thrown away after 6 years, they loose 1/2 their grip after 3 years.
This was highlighted on a DCOV [Duke Club of Victoria] ride to Tasmania last year. A rider went down when the tryes lost grip for no apparent reason. They found out that despite the tyres being new , they were in fact over 6 years old! Sat on the shelf for a long time....
There is a DOT code on the side showing week built and year, Eg 1009, would be week 10 2009, 4597 = week 47 1997.
Tyres are you life, don't be cheap
