bilstein suspension with adjustable perch positions?

hi guys

just after a bit of info in anyone has some! i have done a search but am not turning anything up on these.

http://www.ebay.co.uk/itm/Mazda-MX5-...#ht_500wt_1287


adjustable perch positions so you can raise or lower the height, i have not seen these ones before and just wondered if anyone knew any more about them? and if they would be able to be refurbished.

will probably go cheaply so maybe an option

cheers in advance for any assistance

I have never seen them before. And, nothing the seller shows, makes me believe they are Bilsteins for an MX5. The only adjustable shock body (with C-clip and tray) I've worked with was the Koni yellows.

Most Miata Bilsteins are yellow or silver