Stax UA70 & UA90 vintage 12" tonearms
Victor (Japan) UA7082 10-1/2" tonearm
Ortofon TA110 9" tonearm
These all have supplemental counterweights to handle the SPU. The Stax and Victor arms are 1970-1975 vintage and can still be found fairly routinely on eBay from Japan. Additionally, the Thomas Schick 12" is currently produced, has outstanding bearings, and is an ideal match to the SPU line. I use all of these. One more I don’t have but is equally excellent is the Ortofon TA-210, the broadcast-length version of the TA-110.
Phil