They are a bit far from home, but I know Rod Shaver in Arizona has the T-16 pumps which I believe will interchange.
The rebuild kits for the pumps are available from Mac's for around $30 and as long as you are using a press (hammer will not do) are not terrible to rebuild. However, the seal surface may need to be re-cut if it has pitting. That may fall onto a rebuild shop.
I am sure others will be luckier than we were on a pair of pumps about a year and a half back. We had one siezed, so brought both to NAPA to send in for rebuild. They returned a month later along with a bill for over $700. We will not make that mistake again.
The difference back in the day was that the double pulley was the heavy duty pump which had a actual shaft bearing while the single pulley pumps only had the bronze bushing. I have to wonder if, with the modern day replacement single pulley heavy duty (bearing shaft) pumps available from various suppliers, a double pulley can be made to fit them. Those pumps are reasonably priced.
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