I have the same combo. Type96 and PDI Hopup. The hopup rubber is simply an AEG rubber. I use the First Factory/Laylax Hard (red) one. The little nub for the PDI chamber that presses down on the hopup rubber is only available with the PDI chamber itself. If you've lost it, you'll have to make one yourself.
As far as your problem goes with fitting the barrel onto the PDI chamber... you do have an AEG inner barrel, right? The stock inner barrel or a direct replacement inner barrel is not compatable with the PDI chamber. You have to purchase an AEG inner barrel for use with the PDI chamber.
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