Code:
$ awk -F"," '{gsub(/ .00/,"0.00",$7);gsub(/ .00/,"0.00",$8);print $1","$2","$3","$4","$5","$6","$7","$8}' tmp.txt
RECORD ID,CLIENT,CUSTOMER NAME,2883,12:05,8, 16.39, 191.34
RECORD ID,CLIENT,CUSTOMER NAME,2879,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2873,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2871,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2865,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2858,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2876,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2863,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2868,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2866,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2864,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2882,07:65, 11, 13.77, 160.80
RECORD ID,CLIENT,CUSTOMER NAME,2880,01:72,2,5.63, 65.76
RECORD ID,CLIENT,CUSTOMER NAME,2877,00:00, 18,4.63, 54.00
RECORD ID,CLIENT,CUSTOMER NAME,2874,00:00,2, .51,6.00
RECORD ID,CLIENT,CUSTOMER NAME,2870,01:65,1, .39,4.60
$ sed 's/ \.00/0.00/g' tmp.txt
RECORD ID,CLIENT,CUSTOMER NAME,2883,12:05,8, 16.39, 191.34
RECORD ID,CLIENT,CUSTOMER NAME,2879,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2873,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2871,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2865,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2858,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2876,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2863,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2868,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2866,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2864,00:00,0,0.00,0.00
RECORD ID,CLIENT,CUSTOMER NAME,2882,07:65, 11, 13.77, 160.80
RECORD ID,CLIENT,CUSTOMER NAME,2880,01:72,2,5.63, 65.76
RECORD ID,CLIENT,CUSTOMER NAME,2877,00:00, 18,4.63, 54.00
RECORD ID,CLIENT,CUSTOMER NAME,2874,00:00,2, .51,6.00
RECORD ID,CLIENT,CUSTOMER NAME,2870,01:65,1, .39,4.60
$