idler pulley issues?? need some help please....

[wickedxbo1]

i went to my mechanic and he told me that my s14 notch top sr20det idler pulley was going bad. it is connected to the same belt as the a/c compressor to the crank. ive been looking all over the place for this thing. i was wondering if anyone knew where i can find one or if the pulley from a ka or n/a sr20 could be used. i dont know if the previous owner used the ka a/c compressor or if one came with the swap. any links or info would be really helpful... thanks in advance