Rocky, I mis-spoke when I wrote 4th and 5th were taller in the M1 box. Sorry; it's been 21 years since I bought it! Both are the same as the standard -2 ZF. If I ever had mine apart for any reason, I'd replace 4th with a 0.846 and 5th with a 0.642. Those are the ratios RBT uses.
The pair of ZF's on BAT that Larry mentioned, are neither M1 nor Pantera variants of the ZF transaxle. I suspect they are from a mid-eighties Lancia Rally 037, judging by the Pantera orientation of the gearbox and the gear ratios both units are fitted with. You could physically install one into a Pantera but you'd need to replace a bunch of gears and the R&P. You'd also need a Pantera shifter mechanism, T/O bearing parts and CV joint conversion kit. Because these units were likely used for racing, who knows what else you'd find (damage?) once you got inside!