108 was the number I pulled from this page. Mine never had a system fan. Do you think that the CFM is high enough?It will work. But from the pics it's clearly 3 pin 3 wire fan. Just use 2 of them with standard MDD 2 pin connector.
One question: are you sure that your 1.25 DP has stock 120 mm fan?
IIRC 108 CFM one (Papst) was used in SP and lower clocked DP (867 and maybe 1.0 - not sure here). 1.25 DP should have 149 CFM Delta AFB1212VHE or SHE. All my 1.42 DPs have SHE IIRC.