lowering springs wanted!

[k11man!]

hi all, im after lowering springs for the back only as ive lowered my k11 35 mm but the back wants dropping more. If anybody has any 50mm springs to fit the rear i'd have cash waiting, cheers. Also, has anybody got any 14/15" steel wheels to fit the k11? must be in very good condition, and preferably good tyres, thanks.