I knew already for some times about the BTR-T derived from the T-54/T-55 (much like the israelian Achzarit) but I only found today about the BMP-T that would derive from the T-72/T-90. I found that interesting and post a website on both. Of course, numbers are subject to doubts but they are interesting, nevertheless.
http://www.military-today.com/tanks/bmpt.htm
http://www.enemyforces.net/apc/btrt.htm