SWAP: 25mm diameter USE Alien seat pillar for a 27.2mm one

This ad was also put in the Road classifieds but thought I'd repeat it here in case any MTBers can help out too. I have a black USE Alien alloy seatpost, 270mm long/25mm diameter (it's about 3 and a half years old and in very sound condition) which looks odd in my new frame as the top of the 25-to-27.2 shim doesn't sit snugly against the seat lug; bought a 25mm as it was originally in an old Look carbon road frame. If anyone has a 27.2mm diameter alloy Alien in black I'd like to hear from them with a view to doing an exchange (would also consider a carbon Alien, although not a true like-for-like swap as the carbon one is pricier so I'd be happy to pay any cash difference). I'll also throw in the shim for free.

Thanks in advance for any interest.
David