Hi - thanks for your reply.
SLS '113 inclined' strikers have been out of stock for ages, except for the very late 107 type - which, although difficult to determine from the SLS illustration, appears different as the receiving hole is parallel with the mounting holes and it does not have the 'inclined' shape, and has a different upper face, though I am sure that the mounting holes would pick up.
I am doubtful that it would be ok. Earlier 107 types as on my 1980 107, look to be the same inclined type. Ideally, I would like a pair of four-hole 113 strikers but would risk trying a pair from an earlier 107.