CO2 plug needed for a PGP

[Secretweaponevan]

The short:
Where can I source a CO2 plug for a PGP?
It has a ball-bearing bolt, if that matters. SN#: D064859
Stamped "MFG. FOR PURSUIT MARKETING INC. NORTHBROOK IL. 60062", if that matters for generations of plugs that will work.

The long: (for those that like a yarn)
My neighbor has a job that affords a lot of local travel and it allows him to frequent yard/garage/estate sales. The other day I was working in my garage and heard a "zipzipzipzipzip" sound from my neighbor's yard. I knew it was airsoft.
He was testing an electric airsoft gun that was a good, metal, replica of a Thompson SMG. We got talking about airsoft and I brought up paintball. He mentioned that he used to have an Angel back in his adolescence and had just recently picked up some old brass. We got to telling stories and went about our ways.
10 minutes later, he stops over and gifts me a gently-used PGP (D064859) because he'll never use it (he's keeping the KP3).
It's gently used, not sure if it holds air yet, but it needs a CO2 plug.

Thank you,

[Chuck E Ducky]

I got a standard one for a PGP I could send you.

[Shaftski]

crosman 2240 airgun threads fit perfectly. although might need the longer 2250 size. all over ebay in brass, stainless, or mild steel

[Secretweaponevan]

Thanks. Just getting back to this.
Can't believe it's been almost a year.
Just ordered one on Ebay for $11.11.
Thank you!