dealer lost, code 32 and 37

Fellers,

I posted earlier about our '92 SVX (166k). They are getting a 32 and 37 code, which if i look on www.svx-iw.com says is the left hand and right hand O2 sensors, but the dealer says a code 32 is a rear sensor (which the car does not have). Should i just go get the car and do both 02 sensors myself? please help i am getting suspicious of this dealer after they charged me 14.50 for shop supplies to change the transmission mount and 1 hour of diagnostic time. What shop supplies are used to change a tranny mount?

thanks

Tdog