A650E (35-50LS) 5-speed transmission sump increases ATF capacity which helps to stabilise temperature and makes less work per litre for ATF.
Beefing up auto boxes is like Tesco's, every little helps. Feedback here
For 1J & 2J engines, the sump compatible for dipstick & tube is;
Lexus GS300 ('97 - '04) or IS 200/300 ('01 -'05), part no. 35106-30210, Mr T's price £129, a lot less from breakers.
O-ring for filler tube, part no. 90301-09173.
Drain plug, part no. 90341-10018. (MT10 1.0?)
Drain plug gasket, part no. 35178-50010.
Sump bolts, part no. 90119-06513
(Part no.s & prices Frank Bullitt )
Note: V8 engine installations, require the A650E sump for/from a Lexus 1, 2 or 3 UZ