Trying to find components in this time of chip shortages, we normally spec the RoHS version LM337IMP/NOPB but it is not in stock. There is stock of the LM337IMP. In the datasheet it states "Call TI" regarding the lead finish on the LM337IMP version, what does it have for lead finish? Is it otherwise compatible with lead free solder? It lists the same peak solder temp as the NOPB version.