I have 6spd Shimano indexed shifters - need 7. Swap anyone?

[trail-blazer]

I've just bought a wheelset for a bike and they came with a 7 speed Shimano cassette. The bike has Shimano 1050 6 speed indexed shifters fitted so I'd like to swap for some 7 speed DT shifters, 105, Exage etc. (old wheels were 6 spd freewheel)

(I know I could use them in friction mode but I like indexed gears - a 6 speed cassette is also an option)

Anyone fancy a trade. Mine are in cracking condition. The clear coat was tatty so I polished them up...

Got a few other things I would trade also...

Here is a pic of my shifters fitted to the frame but happy to take better ones should anyone come up with the goods.