Bio, speak to Sherwin or George who are in JHB, they can point you in the right direction. If you do not succeed then you can contact Revo. Its easier to get the pipes from a local supplier to make sure there are no fitment issues and if so, it can be resolved right there.
You are not going to get good quality DPs for the 135 at R1500 x 2; not for the next year or two anyway.