A possible other alternative - if this gentleman is still with us, as he makes custom Saeco sizer dies to order, he probably also does the top punches as well. Given the responses and referrals to the online vender here, perhaps this is more relevant to sourcing finished custom Saeco sizer dies.
Stemming from an ongoing project, last year I spoke with Robert Warrick, owner of C&R Gunship since 1979. A pleasant and lengthy conversation with a very nice man about guns, hunting, casting, reloading, etc ensued.
The bottom line is he told me he will make any size Saeco Lubri-Sizer sizer die, complete with internal plunger rod, for about $75, shipped (to US destinations). Given that the OEM sizer dies are sold at Midway and elsewhere for about $45 plus shipping, a little less than $30 more for a custom size die is a pretty good deal. I needed a .316" Saeco lubrisizer die for a DCRA Lee Enfield target rifle, and of course Saeco/Redding does not offer them at anything close to that size.
I have not seen any of Rob Warrick's work; he was recommended to me by Redding. Right after speaking with him, I gave powder coating a trial run. That more than addressed my problem, so much so that I've converted to powder coating for all my casting. However, as he's managed to make a good living as a gunsmith since 1979 and was recommended by Redding, I assume he knows his business. Anyways, the contact info:
C&R Gunshop
444 Niagara Avenue NE Albuquerque
NM 87107
Phone: 505-345-1773
BTW, he mentioned he's 80 years old last year. While he sounded sharper than most of the people I have to deal with every day, I wouldn't wait another ten years to order a sizer die from him.