if I want to replace the mirrors on my K40 what kind would you

Lasers
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1

if I want to replace the mirrors on my K40 what kind would you suggest?

2

I brought them in a set ,note normal focal lens is 12mm -this one is 19 mm -i had a worn mirror on the movable laser head and a worn focal lens,even with air assist and water trap on air line still have to clean bottom of focal http://www.ebay.com.au/itm/281745543380?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT every 3 hours of cutting 3mm mdf

3

I bought from Ray´s optic store on Aliexpress, ordered feb 24th (3 mirrors, 2 focus lenses) and arrived today. I paid $45 + shipping.
For mine it is 20mm mirrors and 12mm lens.

Store URL: http://www.aliexpress.com/store/218002