FS: Disc caliper brackets (swap for IS-IS +20 rear?)

[EarlofBarnet]

I've just bought a new rear brake and am in need of an IS-to-IS 180mm rear bracket to fit the caliper. So the following brackets are for sale, but if you have the bracket I need then I could do a swap?

1. IS-to-Post mount: 203mm front or 180mm rear
Both in good condition, threads in good condition.

2. IS-to-Post mount: 180mm front or 160mm rear
Both in good condition, threads in good condition.

3. IS-to-Post mount: 160mm front or 140mm rear
In good condition, threads in good condition.

£4 per bracket incl. postage?

Or will swap for an IS-to-IS +20mm rear adapter (for 180mm disc).