One listed on ebay but in the USA https://www.ebay.co.uk/itm/BMW-E85-E86-Z4-E83-X3-Fuel-Pump-Control-Unit-EKPM-CAN11h-FEO-16146766003/302959701434?epid=1209490243&hash=item4689ce2dba:g:NUsAAOSwY~1aCPvs:rk:1f:0.
You could try a search the old threads (left hand tool bar) for Z4 brakers in the UK