i know only because a friend recently got a 3.0si and took me for a spin!
altho tbh i very much doubt a pristine White Z 3.0si will come along at a decent price and allow me to have both cars for a week or so to swap all the parts over and then sell my 2.0 once returned as much as possible to standard lol..... but if that opportunity did ever come along, who knows
i actually live in Norfolk and was playing football in North Walsham couple of weeks back (the place that garage is located) so i could have been within a mile or so of JE lovely Z!!
shame he left the forum, as much as people disagreed with certain things at least he brought a fresh approach to things (good or bad lol)
not sure mate, found on ebay: http://www.ebay.co.uk/itm/like/2006-BMW-Z4-2-Door-Cabriolet-Rear-Bumper-Alpine-White-Vehicle-Breaking/162082703977?hlpht=true&ops=true&viphx=1&_trksid=p5197.c100068.m2280&_trkparms=ao%3D1%26asc%3D20140211130857%26meid%3Dec68fb006ae64846aae8f3de489704d1%26pid%3D100068%26clkid%3D5697334867293261135&_qi=RTM2063723
exactly this! not sure what number (or % left) constitutes "rare" but as mine is "1 of 48" (or possibly less as have only been looking the last year or so) im classing mine as rare
Just checking and found these at ASM too
https://auctions.asm-autos.co.uk/vehicle-list/details/2006-bmw-z4-sport-1995cc-normally-aspirated-petrol-manual-6-speed-2-door-cabriolet-at-asm-auto-recycling-ltd-asm-auto-recycling-ltd/420214?x=0&type=0&make=BMW&trns=0&fuel=0&catc=0&dist=0&sort=0&srch=
and this
https://auctions.asm-autos.co.uk/vehicle-list/details/2009-bmw-z4-0-2497cc-petrol-automatic-3-door-compact-at-chase-autos-ltd-chase-autos-ltd/420917?x=0&type=0&make=BMW&trns=0&fuel=0&catc=0&dist=0&sort=0&srch=
and this
https://auctions.asm-autos.co.uk/vehicle-list/details/2003-bmw-z4-se-roadster-2171cc-petrol-manual-5-speed-2-door-convertible-at-auto-spares---salvage-ltd-auto-spares---salvage-ltd/417020?x=0&type=0&make=BMW&trns=0&fuel=0&catc=0&dist=0&sort=0&srch=