A friend of mine owns a cabinet shop and uses a walk behind forklift for small lift jobs. The charger was thrown in and was too small for the size of the battery (24 V/500 AH?) If memory serves it was a Lester unit that operated from a 120 V/15 A circuit much like this:
https://assets-global.website-files.com/62b1d1ced3ce357ed11bccde/62b1d1ced3ce3512eb1bcec6_32698_E.pdfIt could and did grind out 25 amps for hours until the transformer finally failed. I took it apart expecting a rectifier to have died but they were fine. The rectifiers were stud mount style, with mica insulators on something like 1 x 1 x 3/16 x 4" Al 'L' extrusions bolted to the case. I don't know the rectifiers' numbers or what they were rated for; at least 20 amps and 100 V? Note, there were two rectifier assemblies with two rectifiers on each connected in parallel. I believe the charger was for 48 V initially and modified for 24 V by connecting the secondaries in parallel.
An automotive alternator diode bridge assembly might be a good way to get a rectifier. I can't recommend a particular style or manufacturer. I can't guarantee the PIV ratings of the diodes, but they should be OK. It will need a good heat sink or forced air cooling, depending on the design.
It might be better to just get a 50 amp bridge and be done with it, if such things are made, A 1/4" tab is maybe a bit iffy for this current.
International Rectifier (and others) used to make rectifiers in modules that could be screwed to a plate or heat sink. Connections were made with screw/ring terminals.
Big batteries have low internal resistances so you may have high peak currents when the battery is less than fully charged. This could cause the transformer and rectifiers to run way hotter than expected. The transformer in the Lester charger was ferro-resonant and acted as a current limiter as well as a voltage regulator. Lester also had fuses in the secondary circuit just in case. If a rectifier fails shorted, the battery will discharge into the secondary of the transformer and probably destroy it and the wiring.
Don't know if this helps, good luck!