Weren't the US HL500 frames made by Profab?
My stuff up...I knew it was Profab but got myself confused. Hallman and Endquist commisioned the originals from Profab. I'm sort of right though, Torsten Hallman marketed them.
Profab didnt make Bengts actual bike fram as far as I know but made kits for the US market with so kind of licence agreement . Kits were also made in England, before , I think before the US ,they are many differences between those from the US and UK.
The original Husky modded frame was for testing and once it was sorted new frames were made for Bengt to use in the GP's.
Where is GMC?
As far as originalgoes , GMC kits were jigged from an original , The bike in VMX #2 was built back up from an original frame brought over from Europe . A Viper member has an original.
Bengt used Bilstiens and Marzoochies on the husky framed test bike but raced with Ohlins and Cerianis to win in Luxembourg .He also used works Yam forks in the Trans AMA series.