When I replaced the condenser, accumulator and orifice tube in my 1999 Ranger last summer, I filled the accumulator with about 7 oz of PAG oil, the system called for 8 or 9 oz if I remember right. How would you add the proper amount if it won't fit in the accumulator assembly?
Prior to my overhauling of the system, the compressor would clunk when first engaged, after I did the work and added the oil I was able to get in the accumulator, it has never clunked again. I assume residual oil in the system made up for the missing stuff, so this is more of a future reference question than fixing an immediate problem.
The manufacturer will specify how much oil to add when replacing components, and there are also general rules of thumb. For an accumulator and orifice tube it would probably be a couple of ounces. (Remember that oil is dispersed throughout the AC system, with most landing in the compressor, so you don't add the full oil charge when replacing parts unless you're replacing everything.)
I replaced the condenser as well as those other parts. From the sound of the clunks it made when I was troubleshooting, it sounded pretty much empty, haha. I read somewhere that most of the oil gets taken out when the condenser gets pulled out, so I figured it would be better safe than sorry.
It's been a while since I replaced a condenser but as I recall the rule of thumb for that is about 2 ounces of oil. (The service manual for your vehicle will have the manufacturer-recommended amount.) The main thing is you want the final total in the system to be as close to manufacturer's specification as possible.