http://www.tubeampdoctor.com/product_info.php?cPath=35_81&products_id=540
0,0005uf is the same like 500pf. I think this silva mica would fit. But it is very very tight. Which values do you want
I would prefer 0,0005 then 0,0005 +0,0005= 0,001 and 0,0005 + 0,0022= 0,0027.
Greetz