Beefing up A500 overdrive

Duster346 said
It depends how much fabrication work you want to do to your car. Obviously with the RE/RH transmission and narrow transmission tunnel the gearvendors will require less fabrication work, and in some case no fabrication is needed.

thank you for the invaluable input.

in your opinion does either one have any distinct advantages over the other?

if going with the 42RH are there any "must have" upgrades that you would suggest?