Internationally I would try espressoparts.com. While they do not have anything listed specifically for the BZ02, they could probably point you to one that would fit (for a Pasquini, Brasilia?) Locally (to me), I would try Caffe Tech.
If you're going to replace your shower screen, consider the Ellisse shower screens.
It's more forgiving than the stock BZ02's screens (in terms of finickiness of overdosing) . I'll try to post some pics of both screens to help you understand what i mean.
I used to dose/level and tamp and when i lock and unlock my PF i always find a screen imprint on my puck, and if i underdose i get wet pucks. However, when i installed the new shower screen, i no longer get screen imprints coz it allows for more head space.
It's ironic coz i didn't intentionally ask for the Ellisse shower screens, the distributer sold it to me by mistake :)
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.