617.952 vs. 617.951 Valve Stem Seals

[1983/300CD]

I had an old set of Meistersatz valve stem seals, part number 617 050 00 67.
The intake seals are metal with only a black rubber top.
I looked up the part number, and the site said it was for a 617.951, though it fit a 617.952. I got them on, but the seals were very tight. Pressing them on by hand was impossible for most, and I had to help them over the stem groove by hammering on the tool.

The valve stems slip in the seals okay, and I don't think the seals are going anywhere.

Has anyone else installed the 617 050 00 67 kit in their 617.952, instead of the 617 586 04 05 kit? Do I have anything to worry about?