If memory serves me correctly, the package for a 2N5911 has a different lead configuration from the 151-1032-00 Tek part. I'm also going to note that all my references for this part are labeled "2N5911A".
If you want to do some cross referencing of the datasheets, there's a 2N5911 datasheet available on TekWiki and the 151-1032-00 data is on page 205 of the Tek cross-reference guide that's available from Sphere's website.
Sphere seems to have stock of used 151-1032-00's for $10 USD each, where it's also listed as "2N5911A".
Happy New Year!