The rebuild is not terribly difficult and if you want to do it yourself the only caution would be to make sure you use a kit with modern ethanol resistant rubber and not an old NOS kit. Only other suggestion would be to make sure you hold the pump arm where it would be at max travel when installed in the car so the diaphragm is at full extension before you tighten the screws holding the casting halves together. That prevents the diaphragm from being stretched and the holes or center arm connection possibly being damaged when the pump is placed back in operation. All of our major vendors should offer a kit and if not, several of us have used kits from Then and Now Automotive.
https://www.then-now-auto.com/shop-2/ To get the correct kit it is probably best to have the brand and get the pump model number stamped on the mounting flange and give them a call or send an email. Their website is still under construction and mentions using a search bar to find the proper kit but I don't see one to use.
If you would prefer not to do the work then Kanter, Max and a few others offer already rebuilt pumps on an exchange basis. Last I checked an already rebuilt was about double the price of the bare kit.
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