I'm not too smart - part number for Rotel RA-840BX3 bias adjustment?

Hi all,

So, I thought to myself "I have a multimeter, and I have a service manual; how hard can it be to adjust bias on this amp I have?" It turns out, if you break the top off the part you're adjusting...pretty difficult. I've dealt with soldering on boards before (bit of a pinball guy), but I need to order a new part and am not sure how to track down the part number. According to the service manual, it's a 220 ohm one, but I have no real idea where to search for part numbers/names, as the service manual is 30+ years old and part numbers appear to have changed. Could anyone offer any advice as to where to look? Thanks so much; sorry for the basic question.

VR602 - what I broke
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VR601 - what it looked like before I broke it
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