If your not having any luck with Agra engineering, then try this link:
http://www.devprecisionengineers.comThis is an Indian based reseller of Indian engine parts (I have also used this company, but I have since moved away from them to deal direct with Indian suppliers).
This company will source the parts you require, but you will pay slightly more for his services in comparison to going direct. For convenience this can be a good way of dealing with the Indians, particularly if you have an eclectic mix of parts that need to be sourced from several suppliers. This company can then amalgamate all of it into one consignment and then send it to you all in one parcel.
Another thought for you to consider, although your big end will clean up at -0.020" under size, if you can find -0.030" or -0.040" big end bearings, you could have them resized to -0.020" under size, as these are conventional white metal steel backed bearings, so you have no concerns about machining off any overlay material.