I have converted all of my cars except three cabooses which have body-mounted Rapido couplers.  Has anyone been able to convert similars to knuckle couplers?

Both engines were purchased last December ... a Bachmann N61651 EMD NW2 UP #9155 and a Bachmann N62452 EMD GP-7 UP #116. 

Thanks so much for the responses.  I also have two Bachmann diesel engines with knuckle couplers.  Are they compatible with the MT couplers?

I have some very old freight and oldtime passenger cars with what i believe are Rapido couplers.  I'd like to convert them to Micro trains couplers.  Most are labeled as "Bachmann Hong Kong" with others labeled "Atlas USA."  I've gone to the Micro Trains website and pulled up their conversion charts, BUT I'm have a difficult time understanding the charts and what to do next.