Parts question with photos - I tried looking for these, but didn't have any luck. SS product page is only useful if you know exactly what your looking for.
There won't be any 10E/ER specific parts on the SS product page, they were made three manufacturers ago.
The bolt that holds the tailstock to the pivot base is 1/2"-13 tpi x 1-3/4 low, socket head cap screw
Similar to the shoulder bolt for mounting the jig saw, but no shoulder.
Looking on line I am having trouble finding an exact match.
I did find this Door Striker bolt, which looks similar but longer.
or you could use a regular hex head bolt.
Note these were only used on the later tailstocks with the long bracket extension tables, the earlier ones with the shorter bracket used a had a knob similar to the one that holds the extension table to the tailstock, but shorter.
10ER #23430, 10ER #84609, 10ER #94987,two SS A-34 jigsaws for 10ER.
1959 Mark 5 #356595 Greenie, SS Magna Jointer, SS planer, SS bandsaw, SS scroll saw (gray), DC3300,