Yes it could be into 64 before the folded ones were used, my one has them but its near the end of the line [Oct 1964].
They're not mine but I know a lad with some they are very rare yes the cast type I have to bid strong on parts like these which takes the love out of the job as parts are rare now
Right been in contact
Last ones he sold in an auction made £97 each or the pair I can't remember what he said now, these are from canada and in nice condition I believe I think they are new genuine old stock again I'll have to double check
Not sure smid I struggle keeping up with new products
Ha know what you mean I,m a one trick pony with a wee bit of a certain age of red ones
Afraid not the ones I saw were cast ones not exact but close.
May be too late just spied these on EBay ,,https://www.ebay.co.uk/itm/Massey-F...518676?hash=item3faaaebf94:g:NkoAAOSwxKNbkYGe
He got sorted out sandy but still with a bit of work them eBay spacers will get somebody out of trouble
