Early 90 HDJ81 Brake Booster

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Seikin were an oem manufacturer that might still produce them.

You should be able to substitute with a booster from any of the later 80series or 105series. Just check the bolt patterns are the same on the master cylinder side
 

Also, try @cruiseroutfit or their store at Cruiserteq.com
 
Seikin were an oem manufacturer that might still produce them.

You should be able to substitute with a booster from any of the later 80series or 105series. Just check the bolt patterns are the same on the master cylinder side

Seiken is not OEM.

Aisin/ADVICS or Bosch Braking Systems were OEM for service part support, generally depending on contractual agreements for monthly supply.

Seiken is aftermarket that reboxes other suppliers parts; They act as a front for OEM supplier companies that do not generally sell direct-to-consumer within the authorized Toyota dealership system for service parts support.

They also buy excess manufacturing parts and rebadge and sell under their own name.
 
@clay763 if you haven't figured this out, I just replaced my brake booster with an upgraded (2x the boost) booster from Performance Diesel Intercooler (PDI) in Australia. PDI 80 Series Dual Diaphragm Brake Booster - https://www.performancedieselintercoolers.com.au/products/pdi-dual-diaphragm-brake-booster-landcruiser-80-series I also installed a new OEM master cylinder and the difference is amazing. I ordered the booster along with their intercooler kit and a Gturbo all at once, the prices are in Australian dollars which are converted to USD once you pay (much less).

Cheers!

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