try to find just the line and the elbows. you have no need for the ASa since you're already getting one.
http://www.macrolineguy.com/
this site sells macro line for cheap. you can also buy swivel 90 degree elbows for $4.00 each. you need at least one of them. it looks like the promasters HPR has one on it already. actually, if you bought it off actionvillage, it comes with macroline, so all you need is the 90 degree swivel elbow.