So looks like you are set on getting an identical pair of pliers. If that is the case, look for them on ebay. I looked around a bit, and they only seem to come up on ebay from time to time. Also keep your eyes open for a pair of Vaco No. 1900. They are the OEM for the pair of Mac pliers you have. Vaco is now Klein if I recall correctly.
Now, if there are certain aspects of those pliers that you like, such as US made, there are other options. Snap On makes some excellent forged US made strippers/crimpers, and I am sure there are other manufactures out there.