It was MIWA ZLT BS51, a long-seat display lock.

When I checked the damaged tubular body after unlocking, MIWA was a diamond-shaped cam block for the tubular.Other companies are square.Not suitable for stock.So it will be a complete replacement.

"MIWA also put out this kind of thing."

The Nagasawa display lock TXS-1K42-SB has two additional holes for penetration.The front is not perfect either.
Adjust and process.It fits.
MIWA's tubulars are rarely available, and the profit margin is poor, so I didn't purchase them.