[SilverStreak] rim/tire assistance needed

[MSC06USNret@xxxxxxx]

Hello all, I  currently have a tire/rim dilemma with my 1958 Silver Streak
Clipper.  I have four old Firestone Transport 150  7-14.5 load range D 8 ply
rating tires on the trailer now.  They have good tread but are old and Ibm
sure
I will suffer tread separation with any road time.  Everything that I have
read on this  address over the past years highly suggests converting to 15b
rims/tires:  better tires(?) but certainly more  availability should I suffer
a
double blow-out anywhere during a road trip.  And I agree with this
assessment.
Now to my problem.  The current tires give me B>b clearance  against the
front
edge of the wheel well and they measure 26b across with the  14.5 rims.
Does anyone have any  ideas what 15b rims/tires I can get so that they will
fit into my wheel  wells?  On reading back though my  many copies off of this
link I have found tires listed as Sumitomo 7.00Rx15  radial load range D 6 ply
and Yokohama 700-15 but canbt tell whether either of  these would measure
out
to the 26b maximum that I need in order to fit inside my  wheel well.
Has anyone else  found a solution to this problem with an older silver
streak?  Ibll send blessing and prayers for any  help anyone can provide.
And again
 thanks to everyone for all the sharings.  Jim -)