New spark plug tube seals differ from original

I undertook changing the valve cover gaskets + spark plug tube seals on my 2008 Impreza 2.5i. Other than rounding off both of the engine fasteners before getting them off with a special socket and not being able to find 14mm 1.25 pitch flange nut replacements at hardware stores near me, it was going great until I went to put the first cover back on and noticed it wasn't fitting quite like before. I then noticed the new seals stand 1/8 inch taller than my old ones. I called Fel-Pro (manufacturer) and two Subaru dealerships who both said the seals I have are the only ones they know of for my model, and they should just "flatten out" over time. I had initially assumed they were the wrong size because the bolts for the valve covers are pathetic and only supposed to crank to 5 foot pounds.  Part #VS 50780 R