help on configuring squid2.0s snmp?

Hi there

I'm testing a couple of squids/Linux and it would be very nice
to extract statistical data. However, I can't seem to make
squid respond well to snmp requests, for example:

snmpwalk -p 3401 localhost public .1.3.6.1.4.1.3495.1.1
enterprises.3495.1.1.1 = 86016
enterprises.3495.1.1.2 = 308
enterprises.3495.1.1.3 = Timeticks: (66320) 0:11:03

I'm also using mrtg-2.5.4c, but since I was unable to apply
the patch, I'm trying
http://ircache.nlanr.net/Cache/Statistics/mrtg/mrtg.pl and
http://ircache.nlanr.net/Cache/Statistics/mrtg/mibdefs.pm

Since I don't get the full names, mrtg wont parse the reply from squid
(at least that's what I think...)

./mrtg.pl mrtg.cfg
SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 3 (OID: 1.3.6.1.4.1.3495.1.1.3)
SNMPv1_Session (remote host: "193.137.77.13" [193.137.77.13].3401
                  community: "public"
                 request ID: 2113289660
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 3 (OID: 1.3.6.1.4.1.3495.1.1.3)
SNMPv1_Session (remote host: "193.137.77.13" [193.137.77.13].3401
                  community: "public"
                 request ID: 431958097
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
SNMPGET: Failed to reach target:
"cacheSysVMsize&cacheSysStorage:public@193.137.77.13". I tried 2 times!

--
Any help would be appreciated, I'm running out of options (hand code a
very small acquisition client based on snmpget...)
Aditional information:
mrtg.cfg (for tests only):
# default for all graphs
WorkDir: /home/httpd/website_LAN/mrtg/
WriteExpires: Yes
Background[^]: #e0e0d0
MaxBytes[^]: 30000000
Colours[^]: DARK GREEN#00cb0c,BLUE#1000ff,DARK GREEN#006600,VIOLET#ff00ff
# svc 5 min
Target[httpsvc]:
cacheSysVMsize&cacheSysStorage:public@x.y.z.w
Title[httpsvc]: HTTP svc
PageTop[httpsvc]: <H1>Cache Statistics: HTTP Median Service Time (5
min)</H1>
Suppress[httpsvc]: y
LegendI[httpsvc]:  HTTP 5min svc
LegendO[httpsvc]:  
Legend1[httpsvc]:  HTTP 5 min cache Median Service Time
Legend2[httpsvc]:  
YLegend[httpsvc]: msec
ShortLegend[httpsvc]: ms
Options[httpsvc]: nopercent, gauge