Potentially a Sonoma BG might not be far off, has the width but not a gel version, if I had to recommend something that would give same/similar comfort then a Madison G12 is your best bet, possibly the G100 is the modern variant of it.
luck finding something
My son had one of these on his early Sirrus, you might want to measure the width as these Body Geometry saddles were 143 or 155mm, it looks like a 155 though.
https://www.ebay.co.uk/itm/284321998750?hash=item4232e9679e:g:JKkAAOSwCStgrO-y
https://www.ebay.co.uk/itm/255000413842?hash=item3b5f358692:g:negAAOSwPqNgnYBQ
A knackered one https://www.ebay.co.uk/itm/393327428214?hash=item5b94244276:g:y40AAOSwDzhgoWrC
Potentially a Sonoma BG might not be far off, has the width but not a gel version, if I had to recommend something that would give same/similar comfort then a Madison G12 is your best bet, possibly the G100 is the modern variant of it.
luck finding something