Add on photo transistors for DAPD or EOPD.  2 Each.  Note these are included in the EOPD. 

You can get a better price purchasing from any of the usual parts houses but they typically have a minimum of 10 pieces and of course you'll pay a minimum shipping charge.  MRCS offers these parts as a courtesy to our customers who need a small quantity, especially our international customers who want to consolidate shipments.