New to Aprilia but loving it!!

Hi, Another Newbie.
And probably with all the same questions as the others.

I've recently bought a 2008 RSV1000R Factory. I normally ride a Ducati 999 and had a GSXR 750 track bike but just didn't get on with it so bought the RSV to convert to track. Trouble is, I'm enjoying it so much I'm not sure I want to restrict it to the track!! It pains me to say it, but I think I like it more than my lovely red 999.
It had no back brake. Have replaced the master sylinder and bled it profusely. What a rubbish design and layout!! Replaced all pads, chain and sprockets and that's about it so far.
New battery arrived yesterday so will be charged and fitted tomorrow to enjoy this early summer we're having.

Next I wanted to get a set of track tyres and wheels and here's where my confusion starts.
From reading previous threads, I understand the front wheel on later models with radial calipers is 2.5 mm wider that the older wheels? So does that mean I could fit older wheels with wider spacers?
There are lots on ebay but it's difficult to know what will fit.

Anyway, I look forward to reading and learning a lot and hopefiully can contribute something useful sometime. :thumbup

Previous owner did something similar to mine.
It;s the underslung caliper that I just don't understand. It'll never want to get bled properly. Took off the caliper and held it as high as it would go while bleeding. I'm trying to think of a way of bleeding it from the caliper backwards to the master cylinders so that it's pushing the air up.
Would post a photo but can't work out how to do it......will have to ask one of the kids!!